Some Ribbon worm will eat themselves if they cannot find food. This type of worm can still survive after eating up to 95% of its body weight.

Moscow was founded in 1147 by Yury Dolgoruky.

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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