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Author Question: During puberty, boys' testosterone production increases up to five times the level in childhood. ... (Read 99 times) |
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.