According to evolutionary scientists, when people throw up their hands and say "it was just chemistry," they may be on to a fundamental factor in mate choice. Subtle chemical signals, or ...

Compared with a chimpanzee hand, at left, the human hand, at right, has shorter fingers and palms and a longer, stronger more flexible thumb. That not only allows fine manipulation of tools and ...

A chimp would win a fight against a human. Although chimps and humans are ... don’t typically fight unless it’s for their mate or territory. Chimpanzees have a sophisticated social structure ...

The prefrontal cortex has a similar structure in both chimps and humans, although it takes up much more real estate in the human brain than in the chimp brain. There is also a big difference ...

For example, 2xHAR.142 and 2xHAR.114, like many other HARs, function as enhancers, which increase or decrease the level of a gene’s expression. Click the HAR in the chromosome segment to see a ...

And as the human and the chimp in us make a decision on what to do, they refer back to these stored beliefs. Essentially, one system is all about reason and logic (the human system), one is about ...

The human side of the room was crowded with computer monitors, TVs, video cameras, food dishes and machines that dispense treats to the chimps. The chimp enclosures, which look like oversize ...

which can lead to dramatically different outcomes in human and chimp neurons in petri dishes. The human neurons grew multiple neurites, or wiry projections that help the nerve cells send and ...

Mama the chimp and Professor Jan van Hooff first met in 1972 and formed a deep bond Kelli Bender is the Pets Editor at PEOPLE. She has been working at PEOPLE since 2013. Her work has previously ...

These rudimentary stone tools were used for chopping, scraping, and cutting by ancient human ancestors, including Australopithecus garhi and Homo habilis. Much like the chimpanzees, Oldowan ...