Niagara Falls actually stopped flowing back in 1848 for about 20 hours because there was ice that was blocking the Niagara River.

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.

Hydrogen solid is the most dense substance in the world, at 70.6g/cc.

AMAZING FACTS

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