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Calculate the number 519

NUMBERMANIA: Calculate the number 519 using numbers [7, 3, 6, 6, 81, 207] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 13

The first user who solved this task is Nílton Corrêa De Sousa.

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Bells on Cows

Q: Why do farmers put bells on cows?

A: Their horns don't work.

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Marconi

In 1899, Guglielmo Marconi transmitted across the English Channel from Boulogne, France, to Dover, England. The test was requested by the French Government, which was considering purchasing rights to the invention in France. Representatives of the French Government observed operations at both stations. In the same fashion as previous trial transmissions at Marconi's Alum Bay and Poole stations, both transmitter and receiver used a well-insulated copper wire, hung from a 150-ft high mast. Messages were exchanged over the 32 miles, and trials continued for several days, at a speed of up to fifteen words a minute. The success of Marconi's experiments made possible communications without expensive undersea cables.

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