Calculate the number 6930
[6528] Calculate the number 6930 - NUMBERMANIA: Calculate the number 6930 using numbers [5, 2, 4, 1, 65, 763] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 24 - The first user who solved this task is Nasrin 24 T
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Calculate the number 6930

NUMBERMANIA: Calculate the number 6930 using numbers [5, 2, 4, 1, 65, 763] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 24
The first user who solved this task is Nasrin 24 T.
#brainteasers #math #numbermania
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Ballpen in space

When NASA first started sending up astronauts, they quickly discovered that ballpoint pens would not work in zero gravity.
To combat the problem, NASA scientists spent a decade and $12 billion to develop a pen that writes in zero gravity, upside down, underwater, on almost any surface including glass and at temperatures ranging from below freezing to 300 C.
The Russians used a pencil.

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John Ericsson

Died 8 Mar 1889 at age 85 (born 31 Jul 1803).Swedish-American inventor and naval engineer, who became an American citizen in 1847. He was the inventor of the screw propeller, built the first armoured turret warship, the USS Monitor. At the age of 14, he participated in the building of the Göta Canal (1817). A locomotive of his design, The Novelty, participated in a competition with Stephenson's Rocket in 1829. Ericsson invented and patented (No.588, on 1 Feb 1836) a double rotation propeller. In Aug 1861, the American Congress authorized ironclad warships and one ship of the Monitor type designed by Ericsson was ordered. By Mar 1862 the Monitor was ready for sea. He also developed a torpedo boat, The Destroyer, and worked to design his sun-motor engine.
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