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Author Question: Your friends have a 6-month-old son, Ethan. Ethan often is irritable, is prone to anger, and is ... (Read 100 times) |
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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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Everyone has one nostril that is larger than the other.
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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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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
The Dederiyeh I infant from Syria preserves nearly the entire skeleton of a 17- to 19- month-old Nea
Chinese workers on a railway in the far West. “Without them,” Leland Stanford, president of the Cent