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Author Question: A blindfolded person can locate the source of a continuous tone of 1000 Hz that is to the left of ... (Read 44 times) |
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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Oxytocin is recommended only for pregnancies that have a medical reason for inducing labor (such as eclampsia) and is not recommended for elective procedures or for making the birthing process more convenient.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
Running time on 100-meter sprint for men and women master athletes increases with age. Source: Korho
This 1900 photograph of steel factories at night in Duquesne, near Pittsburgh, was tinted by hand. S