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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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Kyle Kinane: This Is America

This is America. It is my God given right to be loudly opinionated about something I am completely ignorant of.

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First space station

In 1971, Salyut 1 (DOS 1) was launched on a Proton rocket by the Soviet Union. Although primitive, having only a single main module, it was the first space station ever in Earth orbit. Its first crew launched in Soyuz 10 but was unable to board the space station due to a failure in the docking mechanism. The second crew arrived in Soyuz 11 and remained on board for 23 productive days. Tragically, a pressure-equalization valve in the Soyuz 11 reentry capsule opened prematurely when the crew returned to Earth, killing all three. Salyut 1 reentered Earth's atmosphere 11 Oct 1971. Six more Salyut stations followed in the Soviet program, leading up to the launch of space station Mir on 20 Feb 1986.«

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