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Did you know?
Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
Everyone has one nostril that is larger than the other.
Did you know?
By definition, when a medication is administered intravenously, its bioavailability is 100%.
Did you know?
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.
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

