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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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Green Grape Says

What did the green grape say to the purple grape?
"BREATHE YOU IDIOT, BREATHE!"

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Dalton's atomic symbols

In 1803, John Dalton recorded in hisnotebook“Observations on the Ultimate Particles of Bodies and their Combinations,” in which he introduced his atomic symbols. On 23 Oct 1803, he delivered a paper on the absorption of gases by water, which he concluded with a series of atomic weights for 21 simple and compound elements.«

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