Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
African bush (savanna) elephant in Etosha National Park, Namibia.
Wombat burrow and scat, Narawntapu National Park, Tasmania
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Sol Duc Falls in Olympic National Park, Washington.