Calculate the number 1191
NUMBERMANIA: Calculate the number 1191 using numbers [7, 6, 2, 7, 48, 936] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers: 0
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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.