Find the area of the black region
[2917] Find the area of the black region - Find the area of the black region accurate up to 3 decimal places. (A=?, a=20, b=10) - #brainteasers #math #riddles - Correct Answers: 39 - The first user who solved this task is Sanja Šabović
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Find the area of the black region

Find the area of the black region accurate up to 3 decimal places. (A=?, a=20, b=10)
Correct answers: 39
The first user who solved this task is Sanja Šabović.
#brainteasers #math #riddles
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Music planets sing?

Q: What kind of music do planets sing?

A: Neptunes!

A planetary music joke was posted on Twitter by Holly on August 10, 2012.

A similar joke was posted on Twitter by Bobby Amasha on October 8, 2012:

Q: What kind of music do planets listen to?

A: Neptunes!

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Cosmic radiation

In 1910, cosmic radiation was the subject of a paper published in Physikalische Zeitchrift by Theodor Wulf, a priest and amateur physicist. He reported the result of four days of observations he made the previous Spring from the top of the Eiffel Tower. He suggested that Earth was under constant bombardment from radiation from outer space, from sources other than the sun. Using a portable electroscope as a detector, Wulf found the ionization rate at the top of the tower was not even half that at ground level. This was surprising, because it was a much smaller decrease than expected from the prevailing belief that the radiation came from the ground.
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