Calculate the number 843
[7637] Calculate the number 843 - NUMBERMANIA: Calculate the number 843 using numbers [5, 5, 4, 7, 43, 642] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 1
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Calculate the number 843

NUMBERMANIA: Calculate the number 843 using numbers [5, 5, 4, 7, 43, 642] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 1
#brainteasers #math #numbermania
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Glenn Wool: Uncle Sam

You know who Uncle Sam is, hes that goat-faced dude who dresses like Apollo Creed. Hes always pointing at you. He wants you. Is that really the imagery we should be listening to? An uncle who looks like hes about to touch you? Uncle Sam wants you to keep a secret.
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Railroad safety

In 1870, Thomas S. Hall of Stamford, Conn., received a patent for the first automatic electric block railroad signal system in the U.S. (No. 103,875). When a train entered a block of track, Hall's electromagnetic device automatically set a signal when the locomotive struck a lever fastened to the rail. The signal was set to danger until the train cleared the block. After Hall invented the device in 1867, it was tried out on the New York and Harlem Railroad.
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