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Author Question: The thin, outer layer of Earth, from 7 to 40 km in thickness, is called the ________. (Read 50 times) |
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There are 20 feet of blood vessels in each square inch of human skin.
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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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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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The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.
Reindeer antlers grow again each year under a layer of fur called velvet. This reindeer is losing th
Earth scientists have devised a scheme to divide the planet’s natural history into distinct time ...