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What is the missing number?

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

Correct answers: 75

The first user who solved this task is Djordje Timotijevic.

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Michael Ian Black: Ambien Racing Game

Heres how you play: on your drive home tonight... when you get, like, 15, 20 minutes away from your house, take an Ambien -- and then just try to beat it. Really fun, and it makes the last part of the drive go really fast, you guys.

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Vitamin C

In 1932, Professor C. Glen King of the University of Pittsburgh isolated vitamin C, a medical and scientific breakthrough, after five years of effort. By painstaking research extracting components from lemon juice - requiring untold thousands of lemons - King and his colleagues isolated a crystalline substance, identified, and later synthesized vitamin C. Their discovery meant prevention of the disease of scurvy, long a source of human suffering. During WW II, King was named chairman of the Nutrition Foundation, which funded research into the nutritional problems facing a country and an army at war. He continued his innovative work with vitamin C until his retirement from Columbia University in 1964.

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