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Calculate the number 504

NUMBERMANIA: Calculate the number 504 using numbers [1, 5, 8, 6, 51, 107] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.

Correct answers: 33

The first user who solved this task is Sanja Šabović.

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Answering Machine Message 55

English accent: Hello, you've reached the phone of Monty Python. I can't come to the phone right now because the witch has turned me into a newt! I'll call you back when I get better.

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Black American invention clothes drier

In 1892, George T. Sampson, a black American inventor, patented what was titled a “Clothes-Drier” (U.S. No. 476,416). In the patent description, he said “The object of my invention is to suspend clothing in close relation to a stove by means of frames so constructed that they can be readily placed in proper position and put aside when not required for use.” Thus, it was a passive drying frame. A few years earlier, on 17 Feb 1885, he had been issued a patent for a “Sled Propeller” (No. 312,388), being adapted from a tricycle frame by adding two runners, and a chain-driven rear wheel for propulsion.«

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