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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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The lipid bilayer is made of phospholipids. They are arranged in a double layer because one of their ends is attracted to water while the other is repelled by water.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
Species richness increases with island size.
A tufted puffin, Fratercula cirrhata, on Triangle Island of the Coast of British Columbia.