Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
A grizzly bear in Yellowstone National Park.
Indian wild boar (Sus scrofa cristatus) at Ranthambore National Park
Swallow-tailed Bee-eater in Etosha National Park, Namibia