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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

A possible scenario for human evolution A possible scenario for human evolution
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Anterior view of the human skeleton. Anterior view of the human skeleton.
Human infants are like all other placental mammals, except they are born at a less developed state. Human infants are like all other placental mammals, except they are born at a less developed state.
Functional MRI Scans These scans of human brains show localized average increases in neural activity Functional MRI Scans These scans of human brains show localized average increases in neural activity
Apoptosis in the formation of a human hand Apoptosis in the formation of a human hand
Video: Structures that affect circulation - venous return

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