Calculate the number 2147
[8105] Calculate the number 2147 - NUMBERMANIA: Calculate the number 2147 using numbers [8, 4, 7, 9, 63, 679] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once. - #brainteasers #math #numbermania - Correct Answers: 0
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Calculate the number 2147

NUMBERMANIA: Calculate the number 2147 using numbers [8, 4, 7, 9, 63, 679] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
Correct answers: 0
#brainteasers #math #numbermania
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Ben Bailey: Slow People in the Subway

The thing I hate the most about the subway is every time I get off the train and Im trying to get out of the station and back up to the street, I end up getting stuck behind these really slow people on the stairs. It happens to me every time I take the subway. Its been happening to me for years. And my question is this: how the hell do they keep beating me to the stairway?
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Edison patent

In 1893, a patent for a "Roller for Crushing Ore or Other Material" was issued to Thomas A. Edison (U.S. No. 498,385). Edison had in mind crushing iron ore. "It is usual in ore crushing machines employing rollers to mount them in pairs on suitable supporting frames and to provide means for driving each pair, and for feeding material to be crushed separately to each pair of rollers and to provide separate means for pressing the rollers of each pair together. In the machine to be described I employ three or more rollers supported side by side in a frame and moveable towards or away from each other, instead of using them in pairs, and a single weight and lever serves to press all of said rollers together."Image: drawing of the side elevation of the apparatus.
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