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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That seat is reserved

A man on the train said: "That seat is reserved." I said: "Well, it's been very forward with me." Pulled up my pants and went on my way.

Lou Sanders

Picture: BBC

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X-10 nuclear reactor

In 1943, the X-10 nuclear reactor at the Oak Ridge National Laboratory went "critical" with a self-sustaining fission reaction - the world's second reactor to achieve one. The reactor took just nine urgent months to build. Over the next year, the reactor performed flawlessly, irradiating thousands of fuel slugs, which were disassembled and dissolved so the plutonium could be extracted, bit by precious bit. It was an experimental reactor far larger and more advanced than Fermi's Chicago pile: a graphite cube 24 feet on each side, with seven-foot-thick concrete walls for radiation shielding. By the end of 1944, the reactor's most urgent mission had been completed and its focus shifted to radioisotope production for medicine and research.[Image: X-10 control console]
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