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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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Sildenafil (Viagra®) has two actions that may be of consequence in patients with heart disease. It can lower the blood pressure, and it can interact with nitrates. It should never be used in patients who are taking nitrates.

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The training of an anesthesiologist typically requires four years of college, 4 years of medical school, 1 year of internship, and 3 years of residency.

The Pantanal, Brazil, seen here in flood condition, is a critical jaguar range area. The Pantanal, Brazil, seen here in flood condition, is a critical jaguar range area.
A photograph of a woman with exophthalmos. This condition is associated with hypersecretion of the t A photograph of a woman with exophthalmos. This condition is associated with hypersecretion of the t
Placenta previa. The condition is caused by the development of the placenta over the cervical canal, Placenta previa. The condition is caused by the development of the placenta over the cervical canal,
Nephrolithiasis. Stones, or calculi, may form in several areas within the urinary tract. When they f Nephrolithiasis. Stones, or calculi, may form in several areas within the urinary tract. When they f
Mirror Box Therapy Compared to Mental Visualization and a Control Condition Mirror Box Therapy Compared to Mental Visualization and a Control Condition
Association of Different HLA Alleles and Increased Susceptibility to Autoimmune Diseases Association of Different HLA Alleles and Increased Susceptibility to Autoimmune Diseases
Video: Reflex arc construction

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