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What is the '?'?

Author: The Math Guru

Correct answers: 65

The first user who solved this task is Sanja Šabović.

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Doing Nothing

Wife: Whatcha doing?
Me: Nothing.
Wife: You did that yesterday.
Me: I wasn't finished.

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Limelight

In 1830, limelight as a form of lighting was presented before scientists at the Tower of London, in a trial with two other lamp designs. Invented by Thomas Drummond in 1816, limelight used jets of oxygen to assist heating lime to incandescence. More brilliant light was formed than by a flame alone. Limelight was adopted in lighthouses and for theatre stages. However, because it required constant tending, it was willingly superceded by newer inventions.

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