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.

Which came first, the chicken or the egg?

Since there could be neither a chicken nor an egg without each already existing in a fully functional state, they both had to have been put in place at the same time. But there are many interdependent parts in the chicken system, and new research has uncovered one of the tiniest--yet most vital--of them.

When waters are murky, how do seals find fish? They don't have a sonar apparatus like whales, and yet they somehow hunt successfully in the dark.

What happens when two dolphins rapidly swim toward the same piece of food? Without some avoidance feature, bottlenose dolphins would become "bashed-nose" dolphins, or worse.

Fortunately, dolphins do have a solution--specialized communication. Where did this capability come from?

Partial remains of two skeletons were discovered in a cave in South Africa, and some scientists think they may be another addition to humanity's evolutionary tree.