It's commonly believed that that grandpa has more knowledge than his young whippersnapper of a grandkid. But do wrinkles on the face really relate to wrinkles on the brain?
WHAT'S INSIDE: INSIDE THE MIND
- The Human Brain
FEATURED: INSIDE THE MIND
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There's no doubt that humans are a violent species. The real question is: Why? Are some people wired differently than others? Is it a matter of survival? Or are we just taking our frustrations out on others in violent ways?
Blushing comes from the same system that causes your fight-or-flight response. But why do your cheeks flush? Is it some kind of universal, wordless apology?