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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
There are more bacteria in your mouth than there are people in the world.
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.
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