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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.