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Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.