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Knock On Wood

This is not a good year to be superstitious. There are three Friday the 13ths on the 1998 calendar. Marking the date is either silly or unnerving, depending on your perspective. (It is likely the latter: According to a recent Gallup poll, more than half of all Americans are superstitious.) In any case, here's a closer look at Friday the 13th, and at the power of superstition in general.

Unravel Superstition!

Written by David Kohn with graphic design by Yevgeny Simkin; quiz design by Ed Bridges

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