Catnip is ten-times more effective at repelling mosquitoes than DEET, the main substance used in insect repellents.

From 1939 to 1942, there was a undersea post office in the Bahamas.

The number Pi (the ratio of the circumference to the diameter of a circle) can't be expressed as a fraction, this means it is an irrational number. When written as a decimal it never repeats and never ends.

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