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MATH PUZZLE: Can you replace...

MATH PUZZLE: Can you replace the question mark with a number?

Correct answers: 140

The first user who solved this task is Nasrin 24 T.

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This morning as I was buttonin...

This morning as I was buttoning my shirt, a button fell off.
After that, I picked up my briefcase, and the handle fell off.
Then I went to open the door, and the doorknob fell off.
I went to get into my car, and the door handle came off in my hand.
Now I'm afraid to pee.

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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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