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Did you know?
Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The horizontal fraction bar was introduced by the Arabs.
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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.