Capuchin monkeys punish fellow chimps for taking more than their fair share.
The jury is still out on whether or not chimps are self-aware. Actually, the same goes for young children.
Have you heard the story about how one monkey on an island figured out how to wash his food, and then other monkeys starting doing it too?
Humans yawn when sleepy to stay alert. But imagine yawning when you're already stimulated.
How are we related to trees? Can we be considered relatives?
Here's an experiment that gives new meaning to mental telepathy. "Harnessing Brain Power" on this Moment of Science.