It is not possible to tickle yourself. The cerebellum, a part of the brain, warns the rest of the brain that you are about to tickle yourself. Since your brain knows this, it ignores the resulting sensation.

The lifespan of a firefly is about seven days. During these days, they are busy trying to find a mate.

The first formal rules for playing the sport of baseball required the winning team to score 21 runs.

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