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Find the number of ways to p...

Find the number of ways to place three black pawns on a chessboard.

Correct answers: 23

The first user who solved this task is Neelima Subrahmanyam.

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A man is being arrested

A man is being arrested by a female police officer, who informs him, "Anything you say can and will be held against you." The man replies, "Boobs!"

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Foucault's pendulum result

In 1851, the rotation of the Earth was proved experimentally by Leon Foucault. After weeks of work, he recorded in his journal that he made this discovery at 2:00 am working with a pendulum in the cellar of the house he shared with his mother. Using a steel wire 2-m long with a 5-kg brass bob, he had made a pendulum suspended in a way that freely permitted it, he found that its plane of oscillation slowly rotated relative to the ground. This led to using much longer versions of his pendulum. He found that the angular velocity of the rotation equalled wsinq where w is the angular velocity of the Earth rotating on its axis, and q is the latitude of the site of the pendulum. He demonstrated his discovery on 31 Mar 1851 for Napoleon.«

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