Replace the question mark with a number
[3243] Replace the question mark with a number - MATH PUZZLE: Can you replace the question mark with a number? - #brainteasers #math #riddles - Correct Answers: 415 - The first user who solved this task is Sanja Šabović
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Replace the question mark with a number

MATH PUZZLE: Can you replace the question mark with a number?
Correct answers: 415
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Rank of full professor

Why does it take so long to become a full professor?
Because it takes ten years to get tenure, and then another ten years to get your fingers back.

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Electric motor

In 1904, the first direct current, interpole, electric motor to be patented in the U.S. was issued to Mathias Pfatischer of Phildadelphia, Pennsylvania under the title "Variable Speed Motor" (No.775,310). His improvement was to "effect commutation without sparking, with a variable load as well as at variable speed and which is capable of rotation in either direction." The new design added auxiliary-field pole-pieces which were small as compared to the main pole-pieces.«
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