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.
That makes chimps, along with orangutans and humans, the only species that appear to recognize themselves in the mirror.