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.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
An overview of the two stages of photosynthesis: light reactions and the Calvin cycle
How noncyclic electron flow during the light reactions generates ATP and NADPH.