Do chimpanzees have their own culture? If so, some researchers would connect their behaviors to aspects of human culture, which they believe supports an evolutionary relationship. But current developments shed doubt on that idea.

The onset of pregnancy presents an apparent contradiction. Ovulating and initially pregnant mothers experience an increase in progesterone. On the one hand, this hormone signals the immune system to back down and lay low. That's critical, because otherwise her body would fight and kill sperm cells as though they were unwelcome invaders, and she would never become pregnant.

Someone said the three-pound human brain is the most complex and least-understood biological structure in the known universe. Scientific research regarding this incredibly intricate organ will never end.
 

Probably the most important physical ability distinguishing man from apes and other animals is his remarkable capacity of language. The ability to communicate with others of his own kind in abstract, symbolic speech is unique to man, and the evolutionist has never been able to bridge the tremendous gulf between this ability and the grunts and barks and chatterings of animals.

What do the oldest European artworks and the domestication of animals have in common? A Penn State University paleoanthropologist suggested that they are evidence of a unique connection with animals that profoundly shaped the evolutionary development of early man.