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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.