Why You Can't Bring Checkerboards to Math Exams
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38:39
There Are Very Few Primes
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17:01
The rarest move in chess
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11:59
This Math Trick is Black Magic
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12:11
How many chess games are possible? - Numberphile
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10:59
Can Chess, with Hexagons?
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18:25
The SAT Question Everyone Got Wrong
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26:06
The 60 Year Quest for the Perfect Sofa
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28:08