Replace the question mark with a number
[2953] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 531 - The first user who solved this task is Miloš Mitić
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 531
The first user who solved this task is Miloš Mitić.
#brainteasers #math #riddles
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Todd Barry: Book Lights

They sell book lights now, a little spotlight you attach to your book. You know, I actually thought about buying one of these, and then I remembered, I own a lamp.
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Simeon North

Born 13 Jul 1765; died 25 Aug 1852 at age 87. American inventor and manufacturer who, like Eli Whitney, incorporated interchangeable parts in manufacturing. After a start in farming, he began a business making scythes in 1795. He expanded to making pistols, first for private use, then under government contract in Mar 1799 for 400 pistols. Larger government orders followed. By 1813, at North's suggestion, a contract for 20,000 pistols included the provision that parts should be interchangeable. Subsequently, he developed machine tools to aid production. North is generally credited for building probably the earliest, though primitive, milling machine to replace filing operations by about 1816 or even earlier. For 53 years, he filled War Dept. contracts, including rifles (from 1823), and devised a 10-round repeating rifle (1825).«
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