Replace the question mark with a number
[3355] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 770 - The first user who solved this task is Sanja Šabović
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 770
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Chris Rock: Natural Causes

When you die at 72, no matter what you die of, its natural causes. Even if you get hit by a truck, its natural causes. Cause if you was younger, youd got out of the way.
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Earliest U.S. celestial photograph

In 1839, John William Draper took a daguerreotype of the moon, the first celestial photograph made in the U.S. He exposed the plate for 20 minutes using a 5-inch telescope and produced an image one inch in diameter. Draper was a professor of chemistry at New York University, New York City. His research in the effect of light upon chemicals had led him to take up photography. He also made his first satisfactory photographic portrait in 1839. A picture he took (1840) of his sister is the oldest surviving photographic portrait. Draper made important scientific contributions in fields of radiant energy, photochemistry, photography, and electric telegraphy. He also anticipated development of spectrum analysis.
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