Rats breed so quickly that in just 18 months, 2 rats could have created over 1 million relatives.

The risk of being struck by a falling meteorite for a human is one occurence every 9,300 years.

Silk was developed in China were it was kept a secret for more than two thousands years. Anyone found trying to smuggle silkworm eggs or cocoons out of the country was immediately put to death.

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