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There are approximately 3 million unintended pregnancies in the United States each year.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first monoclonal antibodies were made exclusively from mouse cells. Some are now fully human, which means they are likely to be safer and may be more effective than older monoclonal antibodies.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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No drugs are available to relieve parathyroid disease. Parathyroid disease is caused by a parathyroid tumor, and it needs to be removed by surgery.