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Did you know?
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 kidneys will clean about 1 million gallons of blood in an average lifetime.
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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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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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If you could remove all of your skin, it would weigh up to 5 pounds.