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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.

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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Dinoflagellates of the supergroup Alveolata and their characteristic alveoli. Dinoflagellates of the supergroup Alveolata and their characteristic alveoli.
An adult male killer whale with its characteristic tall dorsal fin swims in the waters near Tysfjord An adult male killer whale with its characteristic tall dorsal fin swims in the waters near Tysfjord
Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly Hartmann's mountain zebra resting, showing its characteristic essentially unbarred belly
Young boy with characteristic nasal crease from the repeated action of the “nasal salute” caused ... Young boy with characteristic nasal crease from the repeated action of the “nasal salute” caused ...
Psoriasis. This photograph demonstrates the characteristic white skin patches of this condition. Psoriasis. This photograph demonstrates the characteristic white skin patches of this condition.
Symbolic interactionists stress that a basic characteristic of humans is that they attach meaning to ... Symbolic interactionists stress that a basic characteristic of humans is that they attach meaning to ...
Video: Osteoporosis

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