The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Oliver Wendell Holmes is credited with introducing the words "anesthesia" and "anesthetic" into the English language in 1846.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
Gossip and ridicule increase the status insecurity of this time of life.
In early capitalism, children worked alongside adults. At that time, just as today, most street ...
The slight (5 microsecond) difference in the firing of the companion cylinders is enough time to ...