Calculate the number 1564
[2364] Calculate the number 1564 - NUMBERMANIA: Calculate the number 1564 using numbers [8, 4, 5, 1, 91, 717] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 28 - The first user who solved this task is Erkain Mahajanian
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Calculate the number 1564

NUMBERMANIA: Calculate the number 1564 using numbers [8, 4, 5, 1, 91, 717] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 28
The first user who solved this task is Erkain Mahajanian.
#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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Tycho Brahe

Died 24 Oct 1601 at age 54 (born 14 Dec 1546). Danish astronomer whose work in developing astronomical instruments and in measuring and fixing the positions of stars paved the way for future discoveries. He studied the nova of 1572 (“Tycho's star”) showed that it was a fixed star. His report, De nova...stella (1573), was taken by many as proof of the inadequacy of the traditional Aristotelian cosmology. In 1577, he moved to his own observatory on Hven Island (financed by King Frederick II). Before the invention of the telescope, using his nine-foot armillary sphere and his fourteen-foot mural quadrant, he charted the positions of 777 stars with an unparallelled accuracy. In 1599 he moved to Prague, with Johannes Kepler as his assistant.
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