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The human body's pharmacokinetics are quite varied. Our hair holds onto drugs longer than our urine, blood, or saliva. For example, alcohol can be detected in the hair for up to 90 days after it was consumed. The same is true for marijuana, cocaine, ecstasy, heroin, methamphetamine, and nicotine.

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The FDA recognizes 118 routes of administration.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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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 shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

Species interactions. Species interactions.
The Eastern Banjo Frog is a common frog species across eastern Australia. The Eastern Banjo Frog is a common frog species across eastern Australia.
Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania) Fossil remains of anatomically modern humans from the Czech Republic and from China (center crania)
A section through the human brain A section through the human brain
Four kinds of evidence supporting the theory that species evolve. Four kinds of evidence supporting the theory that species evolve.
Zooming in on the respiratory membrane in human lungs Zooming in on the respiratory membrane in human lungs
Video: Inflammation and Fever

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