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MATH PUZZLE: Can you replace...

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

Correct answers: 286

The first user who solved this task is Thinh Ddh.

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A man went to an upscale Manha...

A man went to an upscale Manhattan restaurant and ordered soup du jour. When the waitress brought it out, he exclaimed, "What is this?"
The waitress said, "Why, it's bean soup."
The man said, "I don't care what it has been, what is it now?"

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Joseph von Fraunhofer

Born 6 Mar 1787; died 7 Jun 1826 at age 39.German physicist who was the first to study the dark lines in the solar spectrum, which were seen by Wollaston in 1802, but are called Fraunhofer lines. Fraunhofer was not able to explain them, but measured 576 lines. Over 25,000 have now been found in the solar spectrum. These are caused by selective absorption of those wavelengths by atoms of elements, and their relative positions are the same whether the light is produced by heated metals in the laboratory or seen from those gaseous elements in the sun or viewed from other heavenly bodies. Before other scientists so widely adopted the technique, he used a diffraction grating instead of a prism to disperse the spectrum. He also invented a heliometer.«

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