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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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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.

Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta. Large numbers of plant species can flower at once in this grassland in Kinsella, Alberta.
Human Heart Model Human Heart Model
The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late
Time Line of Human History From Upper Paleolithic Period to the Present Time Line of Human History From Upper Paleolithic Period to the Present
Plot showing the number of genes on each human chromosome Plot showing the number of genes on each human chromosome
Bones of the Human Skull Bones of the Human Skull
Video: Introduction to Epilepsy

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