There is now a simple scientific explanation

for all the differences between humans and chimpanzees:

Humans evolved from marine chimpanzees ('aquatic apes')

that were isolated on Bioko Island (the "Galapagos" of human evolution)

Mammal fossils—found only in dry parts of Africa—do not actually show where humans evolved

Read this peer-reviewed paper, published in the scientific journal

 Ideas in Ecology and Evolution (2020):

A paradigm for the evolution of human features: apes trapped on barren volcanic islands

by Allan Krill, professor of geology

     Watch: Elaine Morgan's TED-talk (2009)    

     Aquatic-ape books and talks by Elaine Morgan

     Book: The Naked Darwinist

Left: Paal Aagaard and Allan Krill present their research in 2018.
    Center: An aquatic ape in Trondheims fjord. (YouTube)
        Right: An 'aquatic ape' reads his Bioko paper. (YouTube)

See also: Paleohumans.com