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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.