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MATH PUZZLE: Can you replace...

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

Correct answers: 340

The first user who solved this task is Donya Sayah30.

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Sherlock Holmes in Heaven

Sherlock Holmes stood at the Gates of Heaven pulling at his pipe awaiting his turn. "I'll let you in," said St. Peter, gesturing toward the heavenly throngs behind him, "if you'll tell me who among these was the first mortal.""Elementary, my dear St. Peter," said the great detective, "he's the one without a bellybutton."

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Cosmic rays

In 1925, the confirmation of highly-penetrating radiation from “finite space” was announced by Robert A. Millikan, calling them “cosmic rays.” He spoke to the National Academy of Sciences at Madison, Wisconsin. Earlier tests with high-altitude balloons, or atop mountains, remained inconclusive as to extra-terrestrial origin. The rays, he thought then, could be of local origin from radioactive materials. However, in 1925, measurements he made up to 27-m below Muir Lake (altitude 3540-m) and Lake Arrowhead (alt. 1530-m) showed rays reached given depths in each by comparable amounts. Thus the atmosphere difference of 2-km did not originate the rays, they had 18 times the penetrating power of any known gamma rays, and possibly were the “birth cries” of infant atoms from fusion or electron capture.«[This work by Millikan on cosmic rays became known to the public in newspaper articles on 11 Nov 1925. He was already a noted scientist, having received a Nobel Prize in Physics in 1923. Atmospheric radiation had been noted before by others since 1901.]

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