A Mystery: Why Can't We Walk Straight?

Robert Krulwich explains a strange experimental finding: people who lack a visible guide point end up walking in circles, however straight they think they are going.

A charming animated science puzzle you'll want to test on your next walk.

Try as you might, you can't walk in a straight line without a visible guide point, like the Sun or a star. You might think you're walking straight, but as NPR's Robert Krulwich reports, a map of your route would reveal y

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