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What is the missing number?

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

Correct answers: 61

The first user who solved this task is Djordje Timotijevic.

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Todd Barry: Hearing Aid

Saw a great product advertised -- it was a hearing aid made to look like a Bluetooth headset. Its for people who are embarrassed about wearing a hearing aid but not about wearing a Bluetooth headset.

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Wilbur Olin Atwater

Born 3 May 1844; died 22 Sep 1907 at age 63. American agricultural chemist who developed agricultural chemistry. Atwater received his PhD from Yale in 1869 for studies on the chemical composition of corn. At Wesleyan College in Connecticut, USA, he studied the effects of fertilizers in farming and established the first agricultural experimental station in the US at Wesleyan in 1875 (which in 1877 became part of the famous Sheffield Scientific School at Yale University). From 1879 to 1882 Atwater determined the chemical composition and nutritive values of fish and animal tissues. During his life, he completed more than 500 energy-balance experiments. They confirmed that the law of conservation of energy governed transformation of matter in both the human body and inanimate world.

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