According to Scientists, vampire bat saliva is the best known medicine for keeping blood from clotting. | A shark always has a row of smaller teeth developing behind its front teeth. Eventually the smaller teeth move forward, like a conveyor belt, and the front teeth fall out. | The green ring that is formed around the yolk of eggs that have been cooked too long is formed by the chemical reaction from the iron in the yolk and the sulphur in the white part of the egg. | Before 1687 clocks were made with only an hour hand. | The watersheds that supply water to New York City are roughly the size of Delaware.
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