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Why do people need to sleep? How do we actually go to sleep? How does sleeping get rid of toxins in the brain? And how come when it's nighttime I don't�

This episode of But Why is a serious one. We're talking about death. Why do people die when they get too old? What happens to people when they die? What�

How are babies made? We speak with Cory Silverberg, author of What Makes A Baby, for answers to questions about how we all come into the world.

Why are yawns contagious? Why do we hiccup? How do teeth get loose? Why do your ears hurt when you drive up over the mountains? Why do we get dizzy when�

Why do your fingers and toes turn wrinkly in the tub? Why are people ticklish? How do you get freckles? Why do some people have birthmarks? How do our�