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A Surprising Pi and 5 - Numberphile

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The Brick Factory Problem - Numberphile

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Can you trust an elegant conjecture?

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Magic Squares of Squares (are PROBABLY impossible) - Numberphile

23:50

Thales's Theorem

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Impossible Squares - Numberphile

30:15

The Bingo Paradox: 3× more likely to win

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Divisibility Tricks - Numberphile