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Did you know?
Your heart beats over 36 million times a year.
Did you know?
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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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
Did you know?
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.