One man studied apes for 50 years. He says nature isn't as cruel as you think.
On the list of animals at risk are several endangered species.
Big brains come at a big cost, however.
Some fish evolved legs and walked onto the land. Right?
Experts argue the jaws of an ancient European ape reveal a key human ancestor.
A long-ridiculed theory about humankind's early leap of consciousness is revived.
We are destroying who they are.
Are these two laws universal throughout nature?