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Replace the question mark with a number

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

Correct answers: 795

The first user who solved this task is Дејан Шкребић.

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Weird conversations with your friend

Having those weird conversations with your friend and thinking. “If anyone heard us right now we'd be put into a mental hospital.

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U.S. stamps celebrate four scientists

In 2011, four U.S. stamps were issued celebrating American scientists, including Asa Gray, one of America's earliest professional botanists. Three Nobel Prize winners were also shown on a background representing their accomplishment. Melvin Calvin, chemist, studied photosynthesis and also conducted pioneering research on the use of plants as an alternative energy source. Maria Goeppert Mayer developed a theoretical model of the structure of the atomic nucleus. She became the second woman to win a Nobel Prize in Physics. Severo Ochoa, biochemist, worked in protein synthesis, and was the first to synthesize ribonucleic acid (RNA).«

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