My favorite example: Rabbit ears!
They're great for cooling. Big ears are great
for cooling.
They're also great for hearing but, it's their
cooling that probably makes them so
successful.
Think of it. If big ears for hearing was such
an awesome adaptation, pretty much every
animal should have them. But if an animal
can exploit big ears for hearing AND for cooling,
it's more likely to stick. Right? The adaption?
So sweating is good for cooling, yeah, but it
literally expels water & salt. So if an animal is
living primarily off of shellfish, filled with water
and salt amongst other things, sweating would
be a great adaptation...
-- --Dumbo.
https://jtem.tumblr.com/post/679904370902679552
So sweating is good for cooling, yeah, but it
literally expels water & salt.
Sweating was IMO
primarily for emergencies -- such as when
they got into fights, or suffered fevers.
That is heavy sweating, a comparatively rare occurrence, and a poor way
to cool since it excretes faster than it evaporates, unlike incipient and light sweating. Dripping sweat is both inefficient and ineffective, and
leads to dehydration.
So if an animal is living primarily off of shellfish,
filled with water and salt amongst other things,
sweating would be a great adaptation...
On Sunday 27 March 2022 at 22:04:42 UTC+1, I Envy JTEM wrote:
So sweating is good for cooling, yeah, but itI so rarely agree with anything you say, that I
literally expels water & salt.
thought I should respond to one of your more
sensible remarks.
Daud Deden recently pointed out that heavy
sweating is -- for the purposes of cooling --
a self-defeating mechanism. Yet humans
often sweat profusely, and gettring rid of
excess salts could well be its function.
In thread: Human hair --- Mar 15, 2022, 1:22:43 AM
I wrote:
Sweating was IMO
primarily for emergencies -- such as when
they got into fights, or suffered fevers.
Daud Deden replied:
That is heavy sweating, a comparatively rare occurrence, and a poor wayI think you've gone wrong here, in that
to cool since it excretes faster than it evaporates, unlike incipient and light sweating. Dripping sweat is both inefficient and ineffective, and leads to dehydration.
So if an animal is living primarily off of shellfish,
filled with water and salt amongst other things,
sweating would be a great adaptation...
the salt content of shellfish would not be
great, especially if the hominins washed
them (or cooked them) in fresh water --
bearing in mind that humans (and probably
all hominins) need only about 0.8 grams of
protein per kg of weight per day -- about
56 grams per day for an adult male.
A more likely source of their excess salt
is the brackish water that they were
occasionally obliged to consume. They
would have dug wells, often in sandy
ground, close to coasts. Sometimes,
especially during drought, these would
have become more salty than the
hominins liked but, if that was all they
had, they'd have had to use it.
Daud Deden recently pointed out that heavy
sweating is -- for the purposes of cooling --
a self-defeating mechanism. Yet humans
often sweat profusely, and gettring rid of
excess salts could well be its function.
So if an animal is living primarily off of shellfish,
filled with water and salt amongst other things,
sweating would be a great adaptation...
I think you've gone wrong here, in that
the salt content of shellfish would not be
great, especially if the hominins washed
them (or cooked them) in fresh water
bearing in mind that humans (and probably
all hominins) need only about 0.8 grams of
protein per kg of weight per day -- about
56 grams per day for an adult male.
A more likely source of their excess salt
is the brackish water that they were
occasionally obliged to consume. They
would have dug wells, often in sandy
ground, close to coasts. Sometimes,
especially during drought, these would
have become more salty than the
hominins liked but, if that was all they
had, they'd have had to use it.
Paul Crowley wrote:
Daud Deden recently pointed out that heavyI've never claimed to originate any of my positions. Most
sweating is -- for the purposes of cooling --
a self-defeating mechanism. Yet humans
often sweat profusely, and gettring rid of
excess salts could well be its function.
are mere extrapolations, logical "Next steps" or simply
moving (appropriately) from one context to another.
...the assumption that interbreeding wouldn't necessarily
be reflected in mtDNA studies even centuries later, applied
to studies on populations tens of thousands of years ago.
So if an animal is living primarily off of shellfish,
filled with water and salt amongst other things,
sweating would be a great adaptation...
I think you've gone wrong here, in thatI think we can confidently rule that one out, seeing how
the salt content of shellfish would not be
great, especially if the hominins washed
them (or cooked them) in fresh water
Aquatic/Waterside Ape would have had to begun BEFORE
fire.
Aquatic Ape = Bigger Brains = Fire
They needed the bigger brains to happen FIRST.
Secondly, people eat them raw today, right now. Why assume
they wouldn't?
What I do assume is that just as soon as they cracked the
secrets of fire, they used it to open shellfish! It would not only
be a great labor saving development but "Bad" shellfish won't
open!
If they don't open, they're bad! So fire saves you labor AND
screens out dangerous shellfish...
I couldn't find any two sources that agree with each other but,
according to the official USDA figures, a dozen raw oysters are
going to have about 280mg of salt.
...another source said 100mg for a single "Pacific Oyster."
Doing the Google, the first source I opened said that claims
were even worse: Over a thousand mgs per serving!
It's a mixed bag, these sources, but even going by the low end
numbers one would EASILY exceed modern sodium and protein
needs.
And ALL OF THESE shellfish are rich in Omega-3s compared to
terrestrial meats, even the least nutritious amongst them.
bearing in mind that humans (and probablySo this Aquatic Diet would have exceeded the need.
all hominins) need only about 0.8 grams of
protein per kg of weight per day -- about
56 grams per day for an adult male.
A more likely source of their excess saltClearly they couldn't have started out that way.
is the brackish water that they were
occasionally obliged to consume. They
would have dug wells, often in sandy
ground, close to coasts. Sometimes,
especially during drought, these would
have become more salty than the
hominins liked but, if that was all they
had, they'd have had to use it.
So, why other then necessity would they ever fall
into that?
So the very first "Aquatic" population hadn't grown
large brains yet. They picked up food. They ate it.
Now that food offered an abundance of protein &
was incredibly rich in brain building Omega-3s,
in comparison to any terrestrial food source.
Yum.
They never had to cook it, and they didn't know how
anyway. But within a generation of turning to the sea
for an abundance of easy protein they would have been
growing brains to the maximum size allowable by their
DNA.
I dunno, but I tend to think that if they were growing
smarter then they weren't creating a whole lot of
useless extra work for themselves...
So that leaves us with shellfish full of lots of water, lots
of salt and no need for cooking. Cooking would come in
handy, eventually, once they got around to inventing it
(or inventing how to start fires) but it wasn't necessary.
-- --
https://jtem.tumblr.com/post/679904370902679552
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/
An important point is that the absolute rate of Na reabsorption
actually increased continuously with increases in sweating rate.
However, the percentage of secreted Na that was reabsorbed in the
duct decreased with a rise in sweating rate. That is, at the lowest
sweating rate 86 ± 3% of the secreted Na was reabsorbed, while at
the highest sweating rate only 65 ± 6% of Na was reabsorbed from
the duct. Therefore, the faster the primary sweat travels along the
duct the smaller the percentage of Na that can be reabsorbed.
On Tuesday 29 March 2022 at 12:45:02 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/Light sweating is effective and common
An important point is that the absolute rate of Na reabsorption
actually increased continuously with increases in sweating rate.
However, the percentage of secreted Na that was reabsorbed in the
duct decreased with a rise in sweating rate. That is, at the lowest sweating rate 86 ± 3% of the secreted Na was reabsorbed, while at
the highest sweating rate only 65 ± 6% of Na was reabsorbed from
the duct. Therefore, the faster the primary sweat travels along the
duct the smaller the percentage of Na that can be reabsorbed.
in H.sap. It cools the skin when it
evaporates and does not lose excessive
quantities of vital salts. It still uses
some (100% - 86% = 14%) which is
why it is not seen among fauna that
evolved in salt-poor habitats.
Heavy sweating much less effective at
cooling. Drops of sweat that drop to
the ground do not cool the skin by
evaporation. It loses large quantities
of vital salts (100%-65%=35%).
It can only have evolved in a habitat
with plentiful supplies of vital salts
and a good supply of fresh water.
Since its commonly assumed purpose
of cooling is so ineffective, it would
seem to have had some other one:
such as dumping excess salts.
Alternatively, or additionally, per Gareth Morgan, eccrine sweat
glands may have been surface reverse osmotic channels which
converted seawater to freshwater in the body via absorption and
filtration, especially during dry season, perhaps in the Red Sea
region. See "A Day at the Beach" at academia.edu where he
explains and tests his hypothesis.
On Friday 1 April 2022 at 00:17:51 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Alternatively, or additionally, per Gareth Morgan, eccrine sweatCrazy idea. Numerous mammal species, over
glands may have been surface reverse osmotic channels which
converted seawater to freshwater in the body via absorption and
filtration, especially during dry season, perhaps in the Red Sea
region. See "A Day at the Beach" at academia.edu where he
explains and tests his hypothesis.
many tens of millions of years, have tried to
survive droughts when close to bodies of sea-
water. Not one has discovered this method.
If any had, it would have become widespread,
and enabled entirely new sets of taxa.
On Friday, April 1, 2022 at 7:42:20 AM UTC-4, Paul Crowley wrote:-
On Friday 1 April 2022 at 00:17:51 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Ignorance is bliss, Gilligan.Alternatively, or additionally, per Gareth Morgan, eccrine sweatCrazy idea. Numerous mammal species, over
glands may have been surface reverse osmotic channels which
converted seawater to freshwater in the body via absorption and filtration, especially during dry season, perhaps in the Red Sea
region. See "A Day at the Beach" at academia.edu where he
explains and tests his hypothesis.
many tens of millions of years, have tried to
survive droughts when close to bodies of sea-
water. Not one has discovered this method.
If any had, it would have become widespread,
and enabled entirely new sets of taxa.
Heart failure due to high salt & low water levels
..
"Similar to reducing salt intake, drinking enough water and staying hydrated are ways to
support our hearts and may help reduce long-term risks for heart disease," said Natalia
Dmitrieva, Ph.D., the lead study author and a researcher in the Laboratory of Cardiovascular
Regenerative Medicine at the National Heart, Lung, and Blood Institute (NHLBI), part of NIH.
Idiots (jerm, PC, MV et al) say you need salt to hydrate.
since there is salt in animal products.
(One mammoth had enough salt to supply a hunter for 6 years of salt.)
On Saturday 2 April 2022 at 02:58:41 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Heart failure due to high salt & low water levelsYou've dredged up something from the early
..
"Similar to reducing salt intake, drinking enough water and staying hydrated are ways to
support our hearts and may help reduce long-term risks for heart disease," said Natalia
Dmitrieva, Ph.D., the lead study author and a researcher in the Laboratory of Cardiovascular
Regenerative Medicine at the National Heart, Lung, and Blood Institute (NHLBI), part of NIH.
phases of the 'salt wars'. Still going on, of
course. And human males are still consuming
a lot more salt than females, and are way
over 'recommended levels'.
The 'science' behind the these recommended
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure. And since "humans evolved
on the savanna" humans shouldn't be able
to cope with it as well.
But google "Salt and mortality" OR
"Low salt and mortality"
Idiots (jerm, PC, MV et al) say you need salt to hydrate.I've never said anything of the kind. Obviously
we need water. But since we sweat so much
(especially when it's hot or we're physically
active) we also need a lot of salt.
since there is salt in animal products.No carnivores sweat.
the loss of salt.
https://www.smithsonianmag.com/science-nature/60-mammoths-house-russia-180974426/#:~:text=Researchers%20have%20generally%20considered%20them,2014)%20is%203%2C000%20years%20older. 22ka mammoth dome huts winter ice age(One mammoth had enough salt to supply a hunter for 6 years of salt.)How long does an elephant corpse remain
edible in a hot climate?
On Saturday, April 2, 2022 at 3:52:48 PM UTC-4, Paul Crowley wrote:- https://www.insider.com/signs-of-a-heavy-drinker-just-by-looking-experts-say-2022-3?amp
On Saturday 2 April 2022 at 02:58:41 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Again, "heart failure due to high salt and low water levels". The issue is not salt, but water sufficiency to enable the metabolic plumbing to operate optimally.Heart failure due to high salt & low water levelsYou've dredged up something from the early
..
"Similar to reducing salt intake, drinking enough water and staying hydrated are ways to
support our hearts and may help reduce long-term risks for heart disease," said Natalia
Dmitrieva, Ph.D., the lead study author and a researcher in the Laboratory of Cardiovascular
Regenerative Medicine at the National Heart, Lung, and Blood Institute (NHLBI), part of NIH.
phases of the 'salt wars'. Still going on, of
course. And human males are still consuming
a lot more salt than females, and are way
over 'recommended levels'.
The 'science' behind the these recommendedNot relevant here, the focus is on sufficient hydration.
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure. And since "humans evolved
on the savanna" humans shouldn't be able
to cope with it as well.
But google "Salt and mortality" ORNot relevant here. Hydration.
"Low salt and mortality"
Sounds like Gilligan is lost on the savannah, hot and physically active with no portable shade.Idiots (jerm, PC, MV et al) say you need salt to hydrate.I've never said anything of the kind. Obviously
we need water. But since we sweat so much
(especially when it's hot or we're physically
active) we also need a lot of salt.
Irrelevant here.since there is salt in animal products.No carnivores sweat.
They can't afford
the loss of salt.Vegetarian fauna need salt, carnivores (including humans) get it in their diet.
https://www.smithsonianmag.com/science-nature/60-mammoths-house-russia-180974426/#:~:text=Researchers%20have%20generally%20considered%20them,2014)%20is%203%2C000%20years%20older. 22ka mammoth dome huts winter ice age(One mammoth had enough salt to supply a hunter for 6 years of salt.)How long does an elephant corpse remain
edible in a hot climate?
Pygmies invite neighboring pygmy bands to join, the elephant is soon portioned out.
On Sunday, April 3, 2022 at 12:48:41 AM UTC-4, DD'eDeN aka note/nickname/alas_my_loves wrote:
On Saturday, April 2, 2022 at 3:52:48 PM UTC-4, Paul Crowley wrote:
On Saturday 2 April 2022 at 02:58:41 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Again, "heart failure due to high salt and low water levels". The issue is not salt, but water sufficiency to enable the metabolic plumbing to operate optimally.Heart failure due to high salt & low water levelsYou've dredged up something from the early
..
"Similar to reducing salt intake, drinking enough water and staying hydrated are ways to
support our hearts and may help reduce long-term risks for heart disease," said Natalia
Dmitrieva, Ph.D., the lead study author and a researcher in the Laboratory of Cardiovascular
Regenerative Medicine at the National Heart, Lung, and Blood Institute (NHLBI), part of NIH.
phases of the 'salt wars'. Still going on, of
course. And human males are still consuming
a lot more salt than females, and are way
over 'recommended levels'.
The 'science' behind the these recommendedNot relevant here, the focus is on sufficient hydration.
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure. And since "humans evolved
on the savanna" humans shouldn't be able
to cope with it as well.
But google "Salt and mortality" ORNot relevant here. Hydration.
"Low salt and mortality"
Sounds like Gilligan is lost on the savannah, hot and physically active with no portable shade.Idiots (jerm, PC, MV et al) say you need salt to hydrate.I've never said anything of the kind. Obviously
we need water. But since we sweat so much
(especially when it's hot or we're physically
active) we also need a lot of salt.
Irrelevant here.since there is salt in animal products.No carnivores sweat.
They can't afford
the loss of salt.Vegetarian fauna need salt, carnivores (including humans) get it in their diet.
https://www.smithsonianmag.com/science-nature/60-mammoths-house-russia-180974426/#:~:text=Researchers%20have%20generally%20considered%20them,2014)%20is%203%2C000%20years%20older. 22ka mammoth dome huts winter ice age(One mammoth had enough salt to supply a hunter for 6 years of salt.)How long does an elephant corpse remain
edible in a hot climate?
Pygmies invite neighboring pygmy bands to join, the elephant is soon portioned out.- https://www.insider.com/signs-of-a-heavy-drinker-just-by-looking-experts-say-2022-3?amp
Dehydration
You've dredged up something from the early..
phases of the 'salt wars'. Still going on, of
course. And human males are still consuming
a lot more salt than females, and are way
over 'recommended levels'.
Again, "heart failure due to high salt and low water levels". The issue
is not salt, but water sufficiency to enable the metabolic plumbing to operate optimally.
The 'science' behind the these recommended..
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure. And since "humans evolved
on the savanna" humans shouldn't be able
to cope with it as well.
Not relevant here, the focus is on sufficient hydration.
..Idiots (jerm, PC, MV et al) say you need salt to hydrate...
I've never said anything of the kind. Obviously
we need water. But since we sweat so much
(especially when it's hot or we're physically
active) we also need a lot of salt.
Sounds like Gilligan is lost on the savannah, hot and physically active
with no portable shade.
On Sunday 3 April 2022 at 05:48:41 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
DD'eDeN aka note/nickname/alas_my_loves
That's not an issue. No one doubts thatYou've dredged up something from the early..
phases of the 'salt wars'. Still going on, of
course. And human males are still consuming
a lot more salt than females, and are way
over 'recommended levels'.
Again, "heart failure due to high salt and low water levels". The issue
is not salt, but water sufficiency to enable the metabolic plumbing to operate optimally.
a lack of fresh water kills humans (and
presumably killed hominins) within a few
days. (It would be interesting to know
how long other primates could survive.)
The 'science' behind the these recommended
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure.
You're trying to re-focus the thread on toon the savanna" humans shouldn't be able..
to cope with it as well.
Not relevant here, the focus is on sufficient hydration.
some non-issue. Hydration is important
to all mammals.
Unlike other animals, humans sweat,..Idiots (jerm, PC, MV et al) say you need salt to hydrate...
I've never said anything of the kind. Obviously
we need water. But since we sweat so much
(especially when it's hot or we're physically
active) we also need a lot of salt.
Sounds like Gilligan is lost on the savannah, hot and physically active with no portable shade.
excreting salts.
on the coast.
on the coasts. (Isn't science hard?)
. .The 'science' behind the these recommended
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure.
High blood pressure = heart failure = relatively dehydrated due to
pumping of viscous fluids through microscopic capillaries is much
harder than in a well-lubricated (hydrated) system.
Unlike other animals, humans sweat,. .
excreting salts.
And recycling most of those salts.
Salts are scarce except on the coast.. .
Salt mines in mountains, salt pans in deserts ...
Therefore humans evolved. .
on the coasts. (Isn't science hard?)
Horses sweat so they must have evolved from coastal seahorses,
QED.
On Wednesday 6 April 2022 at 11:37:49 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
You don't need to get into whatever you. .The 'science' behind the these recommended
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure.
High blood pressure = heart failure = relatively dehydrated due to
pumping of viscous fluids through microscopic capillaries is much
harder than in a well-lubricated (hydrated) system.
imagine is the pathology. All mammalian
blood has a salt level that echoes that of
sea-water. Too much or little and the
animal dies. When habitat of the species
is deficient in salt, individuals will go to
some length (including taking risks) to
replenish their salt levels. Some (such
as chimps) will indulge in carnivory.
When the habitat (and the diet) is salt-
rich, the species must evolve kidneys (and/
or other mechanisms, such as sweating)
that can eliminate the excess. Humans,
cattle, and many other species have
lobulated kidneys that can cope. Inland
species (which usually live in salt-deficient
habitats) don't have lobulated kidneys.
A chimp obliged to live on brackish water
would suffer, where a human or a cow
would thrive.
The mistake that the warriors for "low salt
for humans" make is that they think we
are closer (in this respect) to chimps than
we are to cows.
Light sweating excretes some salts.Unlike other animals, humans sweat,. .
excreting salts.
And recycling most of those salts.
Heavy sweating excretes lots of salts.
Once humans (& hominins) learnt howSalts are scarce except on the coast.. .
Salt mines in mountains, salt pans in deserts ...
to trade in salt, the occupation of inland
areas became feasible -- at least in this
respect.
Horses don't have territories. TheyTherefore humans evolved. .
on the coasts. (Isn't science hard?)
Horses sweat so they must have evolved from coastal seahorses,
QED.
range over wide areas (migrating over
the seasons to find the best grass).
They locate salt deposits within their
ranges.
eccrine glands and lose only a fraction
of the salts that humans do.
On Wednesday, April 6, 2022 at 8:07:18 AM UTC-4, Paul Crowley wrote:
On Wednesday 6 April 2022 at 11:37:49 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
A mammoth had enough salt to supply a hunter's needs for 6 years.You don't need to get into whatever you. .The 'science' behind the these recommended
levels is based on what excess salt does to
chimps. They can't cope with it and get high
blood pressure.
High blood pressure = heart failure = relatively dehydrated due to pumping of viscous fluids through microscopic capillaries is much
harder than in a well-lubricated (hydrated) system.
imagine is the pathology. All mammalian
blood has a salt level that echoes that of
sea-water. Too much or little and the
animal dies. When habitat of the species
is deficient in salt, individuals will go to
some length (including taking risks) to
replenish their salt levels. Some (such
as chimps) will indulge in carnivory.
When the habitat (and the diet) is salt-
rich, the species must evolve kidneys (and/
or other mechanisms, such as sweating)
that can eliminate the excess. Humans,
cattle, and many other species have
lobulated kidneys that can cope. Inland
species (which usually live in salt-deficient
habitats) don't have lobulated kidneys.
A chimp obliged to live on brackish waterChimps are arboreal and primarily get their water from rain in tree hollows, humans and cattle are terrestrial and primarily get their water from mineral-laden streams etc. never from seawater.
would suffer, where a human or a cow
would thrive.
The mistake that the warriors for "low saltWe are terrestrial apes very heavily dependent on freshwater, no-one drinks seawater.
for humans" make is that they think we
are closer (in this respect) to chimps than
we are to cows.
Again, I suggest you check out Gareth Morgan's paper A Day at the Beach.
Back to endurance running on the savannah? Why would a hominin start sweating heavily at a seashore? If hot, just splash.Light sweating excretes some salts.Unlike other animals, humans sweat,. .
excreting salts.
And recycling most of those salts.
Heavy sweating excretes lots of salts.
Do you still claim naledi were salt miners?Once humans (& hominins) learnt howSalts are scarce except on the coast.. .
Salt mines in mountains, salt pans in deserts ...
to trade in salt, the occupation of inland
areas became feasible -- at least in this
respect.
No evidence for that afaik.
Lots of evidence for butchery of game far from seashores.
Visibly so to hominins with spears, digging sticks and baskets.Horses don't have territories. TheyTherefore humans evolved. .
on the coasts. (Isn't science hard?)
Horses sweat so they must have evolved from coastal seahorses,
QED.
range over wide areas (migrating over
the seasons to find the best grass).
They locate salt deposits within their
ranges.
They don't sweat through
eccrine glands and lose only a fractionRight, mobile containers of salt, easily ambushed & speared by gangs of Homo.
of the salts that humans do.
When the habitat (and the diet) is salt-. .
rich, the species must evolve kidneys (and/
or other mechanisms, such as sweating)
that can eliminate the excess. Humans,
cattle, and many other species have
lobulated kidneys that can cope. Inland
species (which usually live in salt-deficient
habitats) don't have lobulated kidneys.
A chimp obliged to live on brackish water
would suffer, where a human or a cow
would thrive.
Chimps are arboreal and primarily get their water from rain in tree
hollows, humans and cattle are terrestrial and primarily get their water
from mineral-laden streams etc. never from seawater.
. .
We all prefer fresh water all the time, butThe mistake that the warriors for "low salt. .
for humans" make is that they think we
are closer (in this respect) to chimps than
we are to cows.
We are terrestrial apes very heavily dependent on freshwater, no-one drinks seawater.
. .
. .This is the skin "reverse osmosis" not
Again, I suggest you check out Gareth Morgan's paper A Day at the
Beach.
. .
. .Because, while the populations are coastal,
And recycling most of those salts.Light sweating excretes some salts.
Heavy sweating excretes lots of salts.
. .
Back to endurance running on the savannah? Why would a hominin
start sweating heavily at a seashore? If hot, just splash.
. .
I've not seen any arguments against, andOnce humans (& hominins) learnt how. .
to trade in salt, the occupation of inland
areas became feasible -- at least in this
respect.
Do you still claim naledi were salt miners?
. .
. .What evidence would you expect?
No evidence for that afaik.
. .
. .I would not say 'lots'. But it is what the
Lots of evidence for butchery of game far from seashores.
. .
. ." . . Easily ambushed . . ". You've fallen for
Right, mobile containers of salt, easily ambushed & speared by gangs of
Homo.
. .
Hominins would have dug wells.
On Wednesday 6 April 2022 at 14:37:05 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
When the habitat (and the diet) is salt-. .
rich, the species must evolve kidneys (and/
or other mechanisms, such as sweating)
that can eliminate the excess. Humans,
cattle, and many other species have
lobulated kidneys that can cope. Inland
species (which usually live in salt-deficient
habitats) don't have lobulated kidneys.
A chimp obliged to live on brackish water
would suffer, where a human or a cow
would thrive.
Chimps are arboreal and primarily get their water from rain in tree hollows, humans and cattle are terrestrial and primarily get their water from mineral-laden streams etc. never from seawater.
. .
Hominins would have dug wells.
they'd get contaminated with salt from the
sea.
We all prefer fresh water all the time, butThe mistake that the warriors for "low salt. .
for humans" make is that they think we
are closer (in this respect) to chimps than
we are to cows.
We are terrestrial apes very heavily dependent on freshwater, no-one drinks seawater.
. .
when -- on occasion -- the only water we
could get was brackish we'd have to drink
it. That happened often enough in our
evolutionary history for our kidneys to
adapt.
Again, I suggest you check out Gareth Morgan's paper A Day at theThis is the skin "reverse osmosis" not
Beach.
. .
found in ANY known terrestrial mammal.
Nice idea, but not a sensible suggestion.
Because, while the populations are coastal,Back to endurance running on the savannah? Why would a homininAnd recycling most of those salts.Light sweating excretes some salts.
Heavy sweating excretes lots of salts.
. .
start sweating heavily at a seashore? If hot, just splash.
. .
many tribal groups are up to 10 km from
the coast.
trade, they could be further inland.
I've not seen any arguments against, andOnce humans (& hominins) learnt how. .
to trade in salt, the occupation of inland
areas became feasible -- at least in this
respect.
Do you still claim naledi were salt miners?
. .
it seems a sensible suggestion.
. .What evidence would you expect?
No evidence for that afaik.
. .
Lots of evidence for butchery of game far from seashores.I would not say 'lots'. But it is what the
. .
investigators look for, often finding
marks, etc., that they over-interpret.
. ." . . Easily ambushed . . ". You've fallen for
Right, mobile containers of salt, easily ambushed & speared by gangs of Homo.
. .
the 'hunting on the savannah'
small group of rhinos, or zebra, or any adult
mammal > ~100 kg, would readily disperse a
group of hominins.
IF they had done what you imagine, there
would have been numerous (recently and
recorded) modern stone-age H/G tribes in
Africa living like that.
Hominins would have dug wells.The professionals have also made the subject
. .
Not necessary, since they lived along shallow crystalline streams.
. .
The Congo basin has lots of briny swamps which can't drain into the riverLots? There may be a few -- but no basis
due to geography.
. .
. .A uniquely imaginary human trait.
This is the skin "reverse osmosis" not. .
found in ANY known terrestrial mammal.
Nice idea, but not a sensible suggestion.
A uniquely human trait?
. .
. .Fish need to reduce the salt in the sea-
MV claims fur seals eccrine sweat at the rear
flippers while on land exposed to sun, they also (maybe) drink seawater
while in water.
. .
. .https://www.amnh.org/exhibitions/water-h2o-life/life-in-water/surviving-in-salt-water
. .I don't follow your question. You'll have
Eccrine glands can both excrete out and recycle in salt in solution. Where does the water go that the salt is dissolved in?
. .
. .The seafood is largely protein. Humans
. .Back to endurance running on the savannah? Why would a homininBecause, while the populations are coastal,
start sweating heavily at a seashore? If hot, just splash.
. .
many tribal groups are up to 10 km from
the coast.
Why go inland when seafood is in seawater?
. .
. .Such evidence could be there, but
. .
What evidence would you expect?. .
Salt, extraction tools, diggings.
. .
. .IF they had done what you imagine, there
would have been numerous (recently and
recorded) modern stone-age H/G tribes in
Africa living like that.
Planting and herding have dominated Africa for 1000's of years, except in
the deep rainforest, the deserts, the mountains, the swampy coasts and the arid coasts, where H&G survived marginally.
On Thursday 7 April 2022 at 02:56:50 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Hominins would have dug wells.The professionals have also made the subject
. .
Not necessary, since they lived along shallow crystalline streams.
. .
much easier -- by ruling out of existence all
those nasty predators.
The Congo basin has lots of briny swamps which can't drain into the river due to geography.Lots? There may be a few -- but no basis
. .
for a population that needed salt regularly.
. .
A uniquely imaginary human trait.This is the skin "reverse osmosis" not. .
found in ANY known terrestrial mammal.
Nice idea, but not a sensible suggestion.
A uniquely human trait?
. .
Mermaids? You are saying archaic Homo got their freshwater from eating saltwater fish?. .Fish need to reduce the salt in the sea-
MV claims fur seals eccrine sweat at the rear
flippers while on land exposed to sun, they also (maybe) drink seawater while in water.
. .
water that they drink. Seals probably
get all the fresh water they need by
consuming fish.
. .https://www.amnh.org/exhibitions/water-h2o-life/life-in-water/surviving-in-salt-water
. .
Eccrine glands can both excrete out and recycle in salt in solution. Where does the water go that the salt is dissolved in?I don't follow your question. You'll have
. .
to set it out much more clearly.
. .
The seafood is largely protein.. .Back to endurance running on the savannah? Why would a homininBecause, while the populations are coastal,
start sweating heavily at a seashore? If hot, just splash.
. .
many tribal groups are up to 10 km from
the coast.
Why go inland when seafood is in seawater?
. .
(and presumably all hominins) can'tObviously they spent much of the year not at seashores.
survive on such a high-protein diet.
They need carbohydrates, which they
probably mostly got from USOs, leaves
& fruit. Coastal populations would
have needed to forage inland.
. .
. .Such evidence could be there,
What evidence would you expect?. .
Salt, extraction tools, diggings.
. .
deep down in hard-to-reach places.
. .
. .IF they had done what you imagine, there
would have been numerous (recently and
recorded) modern stone-age H/G tribes in
Africa living like that.
Planting and herding have dominated Africa for 1000's of years, except in the deep rainforest, the deserts, the mountains, the swampy coasts and the arid coasts, where H&G survived marginally.Planting occurred only in the river valleys.
Herding was ruled out by the tsetse fly
until recently (<100 years).
Bushmen) peoples would have performed
in the roles you imagine -- if it was ever
feasible. But it wasn't -- ever. They had
the sense to know that you don't tackle
a zebra (nor any other large animal) if
you want to live.
Highly relevant. Would you try to raise childrenNot necessary, since they lived along shallow crystalline streams.The professionals have also made the subject
. .
much easier -- by ruling out of existence all
those nasty predators.
Irrelevant.
. .
Forgot about the elephantids with 6 years worth of salt...
. .So, given that, in tropical conditions, the
NO. I'm suggesting that seals don't need to. .Mermaids? You are saying archaic Homo got their freshwater from eating saltwater fish?
MV claims fur seals eccrine sweat at the rearFish need to reduce the salt in the sea-
flippers while on land exposed to sun, they also (maybe) drink seawater
while in water.
. .
water that they drink. Seals probably
get all the fresh water they need by
consuming fish.
. .https://www.amnh.org/exhibitions/water-h2o-life/life-in-water/surviving-in-salt-water
. .
. .
. .. .
Salt in sweat gets recycled while in aqueous solution. Thus the eccrines can indeed intake saltwater through the interstitium organ.
. .Salt, extraction tools, diggings.Such evidence could be there,
. .
You are claiming incompetence of Berger's team?. .
All ancient salt mines contain obvious evidence, not these caves.All identified ancient salt caves are large,
. .
. .An asteroid collision ~200 ka made a
. .This event no doubt had some effect
. .Central Africa is largely high plateau -- quite
. .IF they had done what you imagine, there
would have been numerous (recently and
recorded) modern stone-age H/G tribes in
Africa living like that.
Planting and herding have dominated Africa for 1000's of years, except in >>> the deep rainforest, the deserts, the mountains, the swampy coasts and the >>> arid coasts, where H&G survived marginally.Planting occurred only in the river valleys.
Too vague, Central Africa is a river valley, like the US midwest.
. .
. .https://en.wikipedia.org/wiki/File:Tsetse_distribution.png
Herding was ruled out by the tsetse fly. .
until recently (<100 years).
Tsetse flies have a preferred range. Most of Africa was not inside that range.
. .
"Most research indicates that eating more than 2 g per kg of body weight daily of protein for a long time can cause health problems."
Life expectancy in 17th century London was like 27 years, and even that. .
was longer than necessary to overpopulate the dump.
Anyone so ignorant should not be on any
forum concerned with evolution (nor on
one concerned with anything else).
. . https://www.bbc.com/future/article/20181002-how-long-did-ancient-people-live-life-span-versus-longevity
On Friday 8 April 2022 at 05:50:24 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
Not necessary, since they lived along shallow crystalline streams.The professionals have also made the subject
. .
much easier -- by ruling out of existence all
those nasty predators.
Irrelevant.Highly relevant. Would you try to raise children
. .
"along shallow streams" in the presence of large
dangerous predators.
animal that can cope -- it can produce 16So?
offspring in a litter, with frequent litters:
https://www.facebook.com/100071714702312/posts/160297796370710/?sfnsn=scwspwa
Forgot about the elephantids with 6 years worth of salt...Recommended Dietary Allowance (RDA) for protein is a modest 0.8 grams of protein per kilogram of body weight
"Most research indicates that eating more than 2 g per kg of body weight daily of protein for a long time can cause health problems." https://www.medicalnewstoday.com/articles/322825So?
So, given that, in tropical conditions, theHundreds in the Congo, or in the mammoth steppe (freezing winters).
elephant corpse would start to rot within
a few days, how many local people could it
feed?
I'd guess most drink brackish water in harbors and from submarine springs.. .
MV claims fur seals eccrine sweat at the rearFish need to reduce the salt in the sea-
flippers while on land exposed to sun, they also (maybe) drink seawater >>> while in water.
. .
water that they drink. Seals probably
get all the fresh water they need by
consuming fish.
. .
NO. I'm suggesting that seals don't need tohttps://www.amnh.org/exhibitions/water-h2o-life/life-in-water/surviving-in-salt-waterMermaids? You are saying archaic Homo got their freshwater from eating saltwater fish?
. .
. .
drink sea-water (or use special mechanisms
to remove its salt) -- they get the fresh water
they need from the fish they eat.
. .. .
Salt in sweat gets recycled while in aqueous solution. Thus the eccrines can
indeed intake saltwater through the interstitium organ.
Presumably there's some kind of pumping
mechanism that pushes the salty sweat
through filters which can remove some of
the salt. Theoretically, salty sea-water
could be sucked in, and then pushed out
again, through those filters so that the
animal got fresh water in that manner.
BUT it's not seen in nature, not in any
animal.
nearly always a lot colder; this tightensSeals are arctic-adapted.
all the pores on the skin, preventing the
ingress of fluid. No one will sweats in
normal sea-water. Maybe it could --
theoretically -- work in a hot sea-water
bath, or in a heated spa.
. .
No tools or salt found at dinaledi caves.. .Salt, extraction tools, diggings.Such evidence could be there,
. .
You are claiming incompetence of Berger's team?. .
Caves with accessible salt deposits would
be relatively uncommon. I haven't seen
any reference to them in the Dinaledi
system. H.naledi used that cave for
different purposes.
. .
All ancient salt mines contain obvious evidence, not these caves.All identified ancient salt caves are large,
. .
and late in the fossil record. These caves,
and others like them, are labyrinthine.
. .An asteroid collision ~200 ka made a
crater around 75km northwest of the
Dinaledi cave. It hammered through
to a salt layer:
https://en.wikipedia.org/wiki/Tswaing_crater
. .This event no doubt had some effect
on the local hominin population.
. .
Thats the uplands. Congo is lowlands.. .IF they had done what you imagine, there
would have been numerous (recently and
recorded) modern stone-age H/G tribes in
Africa living like that.
Planting and herding have dominated Africa for 1000's of years, except in >>> the deep rainforest, the deserts, the mountains, the swampy coasts and thePlanting occurred only in the river valleys.
arid coasts, where H&G survived marginally.
Too vague, Central Africa is a river valley, like the US midwest.Central Africa is largely high plateau -- quite
. .
unlike the US midwest. Agricultural land
is scarce.
. .
That's today.https://en.wikipedia.org/wiki/File:Tsetse_distribution.pngHerding was ruled out by the tsetse fly. .
until recently (<100 years).
Tsetse flies have a preferred range. Most of Africa was not inside that range.
. .
On Thursday, March 31, 2022 at 5:37:49 PM UTC-4, Paul Crowley wrote:Sea region. See "A Day at the Beach" at academia.edu where he explains and tests his hypothesis.
On Tuesday 29 March 2022 at 12:45:02 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/Light sweating is effective and common
An important point is that the absolute rate of Na reabsorption
actually increased continuously with increases in sweating rate. However, the percentage of secreted Na that was reabsorbed in the
duct decreased with a rise in sweating rate. That is, at the lowest sweating rate 86 ± 3% of the secreted Na was reabsorbed, while at
the highest sweating rate only 65 ± 6% of Na was reabsorbed from
the duct. Therefore, the faster the primary sweat travels along the
duct the smaller the percentage of Na that can be reabsorbed.
in H.sap. It cools the skin when it
evaporates and does not lose excessive
quantities of vital salts. It still uses
some (100% - 86% = 14%) which is
why it is not seen among fauna that
evolved in salt-poor habitats.
Heavy sweating much less effective at
cooling. Drops of sweat that drop to
the ground do not cool the skin by
evaporation. It loses large quantities
of vital salts (100%-65%=35%).
It can only have evolved in a habitat
with plentiful supplies of vital salts
and a good supply of fresh water.
Since its commonly assumed purposeAlternatively, or additionally, per Gareth Morgan, eccrine sweat glands may have been surface reverse osmotic channels which converted seawater to freshwater in the body via absorption and filtration, especially during dry season, perhaps in the Red
of cooling is so ineffective, it would
seem to have had some other one:
such as dumping excess salts.
On Thursday, March 31, 2022 at 7:17:51 PM UTC-4, DD'eDeN aka note/nickname/alas_my_loves wrote:Sea region. See "A Day at the Beach" at academia.edu where he explains and tests his hypothesis.
On Thursday, March 31, 2022 at 5:37:49 PM UTC-4, Paul Crowley wrote:
On Tuesday 29 March 2022 at 12:45:02 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/Light sweating is effective and common
An important point is that the absolute rate of Na reabsorption actually increased continuously with increases in sweating rate. However, the percentage of secreted Na that was reabsorbed in the
duct decreased with a rise in sweating rate. That is, at the lowest sweating rate 86 ± 3% of the secreted Na was reabsorbed, while at
the highest sweating rate only 65 ± 6% of Na was reabsorbed from
the duct. Therefore, the faster the primary sweat travels along the duct the smaller the percentage of Na that can be reabsorbed.
in H.sap. It cools the skin when it
evaporates and does not lose excessive
quantities of vital salts. It still uses
some (100% - 86% = 14%) which is
why it is not seen among fauna that
evolved in salt-poor habitats.
Heavy sweating much less effective at
cooling. Drops of sweat that drop to
the ground do not cool the skin by
evaporation. It loses large quantities
of vital salts (100%-65%=35%).
It can only have evolved in a habitat
with plentiful supplies of vital salts
and a good supply of fresh water.
Since its commonly assumed purposeAlternatively, or additionally, per Gareth Morgan, eccrine sweat glands may have been surface reverse osmotic channels which converted seawater to freshwater in the body via absorption and filtration, especially during dry season, perhaps in the Red
of cooling is so ineffective, it would
seem to have had some other one:
such as dumping excess salts.
Better explained by Gareth on this video:
https://youtu.be/zEQr4DSeYx4
On Tuesday, November 15, 2022 at 5:57:58 AM UTC-5, DD'eDeN aka note/nickname/alas_my_loves wrote:Red Sea region. See "A Day at the Beach" at academia.edu where he explains and tests his hypothesis.
On Thursday, March 31, 2022 at 7:17:51 PM UTC-4, DD'eDeN aka note/nickname/alas_my_loves wrote:
On Thursday, March 31, 2022 at 5:37:49 PM UTC-4, Paul Crowley wrote:
On Tuesday 29 March 2022 at 12:45:02 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/Light sweating is effective and common
An important point is that the absolute rate of Na reabsorption actually increased continuously with increases in sweating rate. However, the percentage of secreted Na that was reabsorbed in the duct decreased with a rise in sweating rate. That is, at the lowest sweating rate 86 ± 3% of the secreted Na was reabsorbed, while at the highest sweating rate only 65 ± 6% of Na was reabsorbed from the duct. Therefore, the faster the primary sweat travels along the duct the smaller the percentage of Na that can be reabsorbed.
in H.sap. It cools the skin when it
evaporates and does not lose excessive
quantities of vital salts. It still uses
some (100% - 86% = 14%) which is
why it is not seen among fauna that
evolved in salt-poor habitats.
Heavy sweating much less effective at
cooling. Drops of sweat that drop to
the ground do not cool the skin by
evaporation. It loses large quantities
of vital salts (100%-65%=35%).
It can only have evolved in a habitat
with plentiful supplies of vital salts
and a good supply of fresh water.
Since its commonly assumed purposeAlternatively, or additionally, per Gareth Morgan, eccrine sweat glands may have been surface reverse osmotic channels which converted seawater to freshwater in the body via absorption and filtration, especially during dry season, perhaps in the
of cooling is so ineffective, it would
seem to have had some other one:
such as dumping excess salts.
out + H2O + energy)Better explained by Gareth on this video:There is an interesting parallel regarding human sweat glands and plant pores (stomata) in leaves: in green plant photosynthesis (intake CO2 -> O2 belched out, H2O sweated out) & respiration (intake O2 x glucose in mitochondrial battery -> CO2 exhaled
https://youtu.be/zEQr4DSeYx4
https://www.pthorticulture.com/en/training-center/basics-of-plant-respiration/own food to survive.
The process of respiration in plants involves using the sugars produced during photosynthesis plus oxygen to produce energy for plant growth. In many ways, respiration is the opposite of photosynthesis. In the natural environment, plants produce their
They use the carbon dioxide (CO2) from the environment to produce sugars and oxygen (O2), which can later be utilized as a source of energy. While photosynthesis takes place in the leaves and stems only, respiration occurs in the leaves, stems androots of the plant. The process of respiration is represented as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + 32 ATP (energy)respiration and photo respiration. The first kind occurs in the presence or absence of light, while the second occurs exclusively in the presence of light.
As with photosynthesis, plants get oxygen from the air through the stomata. Respiration takes place in the mitochondria of the cell in the presence of oxygen, which is called "aerobic respiration". In plants, there are two types of respiration: dark
One wonders if there might be a connection between plant breathing-eating (in opposition) and human eccrine sweating-reverse osmosis. Too early to telli sweat lots.
On Tuesday, November 15, 2022 at 5:57:58 AM UTC-5, DD'eDeN aka note/nickname/alas_my_loves wrote:Red Sea region. See "A Day at the Beach" at academia.edu where he explains and tests his hypothesis.
On Thursday, March 31, 2022 at 7:17:51 PM UTC-4, DD'eDeN aka note/nickname/alas_my_loves wrote:
On Thursday, March 31, 2022 at 5:37:49 PM UTC-4, Paul Crowley wrote:
On Tuesday 29 March 2022 at 12:45:02 UTC+1, DD'eDeN aka note/nickname/alas_my_loves wrote:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6773238/Light sweating is effective and common
An important point is that the absolute rate of Na reabsorption actually increased continuously with increases in sweating rate. However, the percentage of secreted Na that was reabsorbed in the duct decreased with a rise in sweating rate. That is, at the lowest sweating rate 86 ± 3% of the secreted Na was reabsorbed, while at the highest sweating rate only 65 ± 6% of Na was reabsorbed from the duct. Therefore, the faster the primary sweat travels along the duct the smaller the percentage of Na that can be reabsorbed.
in H.sap. It cools the skin when it
evaporates and does not lose excessive
quantities of vital salts. It still uses
some (100% - 86% = 14%) which is
why it is not seen among fauna that
evolved in salt-poor habitats.
Heavy sweating much less effective at
cooling. Drops of sweat that drop to
the ground do not cool the skin by
evaporation. It loses large quantities
of vital salts (100%-65%=35%).
It can only have evolved in a habitat
with plentiful supplies of vital salts
and a good supply of fresh water.
Since its commonly assumed purposeAlternatively, or additionally, per Gareth Morgan, eccrine sweat glands may have been surface reverse osmotic channels which converted seawater to freshwater in the body via absorption and filtration, especially during dry season, perhaps in the
of cooling is so ineffective, it would
seem to have had some other one:
such as dumping excess salts.
out + H2O + energy)Better explained by Gareth on this video:There is an interesting parallel regarding human sweat glands and plant pores (stomata) in leaves: in green plant photosynthesis (intake CO2 -> O2 belched out, H2O sweated out) & respiration (intake O2 x glucose in mitochondrial battery -> CO2 exhaled
https://youtu.be/zEQr4DSeYx4
https://www.pthorticulture.com/en/training-center/basics-of-plant-respiration/own food to survive.
The process of respiration in plants involves using the sugars produced during photosynthesis plus oxygen to produce energy for plant growth. In many ways, respiration is the opposite of photosynthesis. In the natural environment, plants produce their
They use the carbon dioxide (CO2) from the environment to produce sugars and oxygen (O2), which can later be utilized as a source of energy. While photosynthesis takes place in the leaves and stems only, respiration occurs in the leaves, stems androots of the plant. The process of respiration is represented as follows:
C6H12O6 + 6O2 → 6CO2 + 6H2O + 32 ATP (energy)respiration and photo respiration. The first kind occurs in the presence or absence of light, while the second occurs exclusively in the presence of light.
As with photosynthesis, plants get oxygen from the air through the stomata. Respiration takes place in the mitochondria of the cell in the presence of oxygen, which is called "aerobic respiration". In plants, there are two types of respiration: dark
One wonders if there might be a connection between plant breathing-eating (in opposition) and human eccrine sweating-reverse osmosis. Too early to tell...___
My favorite example: Rabbit ears!
They're great for cooling. Big ears are great
for cooling.
They're also great for hearing but, it's their
cooling that probably makes them so
successful.
Think of it. If big ears for hearing was such
an awesome adaptation, pretty much every
animal should have them. But if an animal
can exploit big ears for hearing AND for cooling,
it's more likely to stick. Right? The adaption?
So sweating is good for cooling, yeah, but it
literally expels water & salt. So if an animal is
living primarily off of shellfish, filled with water
and salt amongst other things, sweating would
be a great adaptation...
And what do you think think of Gareth Morgan's (google) "reverse osmosis" hypothesis of human eccrines?
And what do you think think of Gareth Morgan's (google) "reverse osmosis" hypothesis of human eccrines?
Out of my area of knowledge, for certain, but it seems like it should be
so easy to test and thus prove. Does it not? Kind of steers me away
from it.
Op donderdag 17 november 2022 om 05:16:09 UTC+1 schreef JTEM is so reasonable:
And what do you think think of Gareth Morgan's (google) "reverse osmosis" hypothesis of human eccrines?
Out of my area of knowledge, for certain, but it seems like it should be
so easy to test and thus prove. Does it not? Kind of steers me away from it.
Yes.
AFAICS, Gareth's preliminary tests strongly support his idea, but it still needs a lot of investigations, e.g. the effects of aldosterone, ADH etc. on body eccrines.
In any case, very interesting & relevant for human evolution IMO.
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