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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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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.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.