Replace the question mark with a number
[3093] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 795 - The first user who solved this task is Дејан Шкребић
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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.
#brainteasers #math #riddles
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Drone stuck in a tree

Getting my toy drone stuck in a tree hasn’t been the worst thing that happened to me today.

But it’s definitely up there.

By Reddit User https://www.reddit.com/user/porichoygupto/

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First Star Photograph

In 1850, the first photograph of a star was made. At Harvard Observatory (founded 1839), the observatory director, William Cranch Bond and a Boston photographer John Adams Whipple took a daguerreotype of Vega. (A daguerreotype used a copper base with a thin film of polished silver sensitized by iodine vapors to form a thin yellow layer of silver iodide. After the photograph was taken, the plate was developed in a current of magnesium vapor at 75ºC, which adhered to the light-struck parts of the plate. The plate was then fixed in sodium thiosulfate, and rinsed.) Overall, this process to take an image of a star or nebula took many hours of patient skill. Fortunately better photographic materials were later invented.
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