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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.

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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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Asthma cases in Americans are about 75% higher today than they were in 1980.

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