First, if you think about the design of the human body, it’s not actually all that intelligent. We have tailbones, but no tails. We swallow food through the same tube we use to breathe. And don’t 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’t fully developed? There’s no easy answer to that one. But the emerging field of neurolaw is trying to figure out those types of questions.