Replace the question mark with a number
[3215] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 447 - 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: 447
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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The dean of women at an exclus...

The dean of women at an exclusive girl's college was lecturing her students on sexual morality.
"In moments of temptation," said the speaker to the class, "ask yourselfjust one question: Is an hour of pleasure worth a lifetime of shame?"
A sweet young thing in the back of the room rose to ask: "How do youmake it last an hour?"
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Three element vacuum tube

In 1907, the three-element vacuum tube was issued a U.S. patent to its inventor, Dr Lee de Forest as a “device for amplifying feeble electric currents - such, for example, as telephone currents” (No. 841,387). The tube was evacuated, with some remaining conducting gas molecules, and it was suggested using for the heated electrode such material as platinum, tantalum or carbon. He had made a public annoucement of his device a few months earlier, on 20 Oct 1906 at a meeting of the American Institute of Electrical Engineers held in New York City. On 18 Feb 1908, he received another patent for the grid electrode tube (No. 879,532).
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