Your stomach has to produce a new layer of mucus every 2 weeks otherwise it will digest itself.

The postage rate for a letter in 1693 was determined through how much light could pass through the letter. The postage rate would be more expensive if less light went through, and this process was called candling.

One of the most dangerous insect in the world is the common housefly. They carry and transmit more diseases than any other animal in the world.

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