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Did you know?
Asthma cases in Americans are about 75% higher today than they were in 1980.
Did you know?
Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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There are more nerve cells in one human brain than there are stars in the Milky Way.