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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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Cyanide works by making the human body unable to use oxygen.
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More than nineteen million Americans carry the factor V gene that causes blood clots, pulmonary embolism, and heart disease.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).