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MATH PUZZLE: Can you replace...

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

Correct answers: 297

The first user who solved this task is Pratima Singh.

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John Mulaney: Women Friends

I think that women can be friends with each other, but I think it can be tricky sometimes when you try and force women to hang out with each other. You could never put together a heist of women. Like Oceans 11 with women wouldnt work cause two would keep breaking off to talk sh*t about the other nine.

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Sources of all energy

In 1881, in a PresidentialAddress to the British Association, at York, Sir William Thomson (Lord Kelvin) spokeOn the Sources of Energy in Nature Available to Man for the Production of Mechanical Effect. He summarized the natural sources of energy as Tides, Food, Fuel, Wind, and Rain. All except the tides derive energy from the sun. “Heat radiated from the sun ... is the principal source of mechanical effect available to man.” He referred to tide mills, and the possibility of storing energy in batteries between tides, but nevertheless considered the economics impractical for wide application. Windpower he considered “decadent,” but acknowledged coal would become an exhausted resource, thus windmills should generate electrical power. Kelvin also outlined the economics of hydroelectricity.«

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