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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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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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Everyone has one nostril that is larger than the other.
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The average office desk has 400 times more bacteria on it than a toilet.