Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
The Green Pygmy Goose (Nettapus pulchellus) is a small perching duck which breeds in southern New Gu
Extinct North American Megafauna
Face of a southern yellowjacket (Vespula squamosa)
Spain’s North American Frontier, c. 1750
North Atlantic Oscillation
Polar wandering paths for Eurasia and North America