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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 331

The first user who solved this task is Sanja Šabović.

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Jay Larson: Embarrassing Purchase

I bought a plunger the other day. You ever bought a plunger? Its an embarrassing purchase. At first, you think its no big deal. Stand in the line, swinging it. And then you realize everybody knows; you got a situation at home. Nobody buys a plunger on a whim.

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Giovanni Alfonso Borelli

Born 28 Jan 1608; died 31 Dec 1679 at age 71.Italian mathematician, physiologist and physicist sometimes called “father of biomechanics.” Hewas the first to apply the laws of mechanics to the muscular action of the human body. In De motu animalium (Concerning Animal Motion, 1680), he correctly described the skeleton and muscles as a system of levers, and explained the mechanism of bird flight. He calculated the forces required for equilibrium in various joints of the body well before the mechanics of Isaac Newton. In 1649, he published a work on malignant fevers. He repudiated astrological causes of diseases and believed in chemical cures. In 1658, he published Euclidus restitutus. He made anatomical dissections, drew a diver's rebreather, investiged volcanoes, was first to suggest a parabolic path for comets, and considered Jupiter had an attractive infuence on its moons.«

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