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Two mathematicians have proved that a straightforward question—how hard is it to untie a knot?—has a complicated answer.

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Archival clip of Hasan Piker: He’s a booger-eating white supremacist Holocaust denier.

Most of us have little trouble working out how many milliliters are in 2.4 liters of water (it's 2,400). But the same can't be said when we're asked how many minutes are in 2.4 hours (it's 144).