https://www.science.org/doi/10.1126/sciadv.abp9767
1985 (Med.Hypoth.16:17-32), see also ref.15 of the Sci.Adv.paper, and google "coastal dispersal Pleistocene Homo".https://www.science.org/doi/10.1126/sciadv.abp9767
Yes, all para-nasal air sinuses (frontal, ethmoidal, maxillary...) simply are what the word says: air around the nasal passage: a hydrostatic function: very small in coastal fossil Homo & very large in inland Homo (Hn>Hs>He), as I already argued in
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