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First, if you think about the design of the human body, it\u2019s not actually all that intelligent. We have tailbones, but no tails. We swallow food through the same tube we use to breathe. And don\u2019t get us started on tonsils. Biologist Nathan Lents explains these human errors.

Then, P.T. Barnum is probably best known for his outrageous exhibits and larger-than-life personality. But he also shaped our idea of what it means to be an American.

Finally, can someone really be guilty of committing a crime if their brain isn\u2019t fully developed? There\u2019s no easy answer to that one. But the emerging field of neurolaw is trying to figure out those types of questions. \xa0\xa0\xa0