For a while in the 1980s, people were fascinated and confused about what exactly crop circles were. Now we know that they aren't signs left from aliens, but art made by humans. Learn all about these stunning, large form art installations in today's episode.
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Selects: How Free Range Parenting Works
51:15

How the Flexner Report Changed Medicine
37:50

Short Stuff: Safety Coffins
14:00