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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.