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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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.