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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.

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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

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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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There are 60,000 miles of blood vessels in every adult human.

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Alcohol acts as a diuretic. Eight ounces of water is needed to metabolize just 1 ounce of alcohol.

General structure of an animal cell General structure of an animal cell
Defensive mutualism involves species that receive food or shelter in return for providing protection Defensive mutualism involves species that receive food or shelter in return for providing protection
Levels of structure in proteins Levels of structure in proteins
Basic DNA structure Basic DNA structure
How to know when a function is increasing or decreasing using calculus (Part 1) How to know when a function is increasing or decreasing using calculus (Part 1)
Comparing the structure of a primary shoot from (A) a monocot and (b) a eudicot. Comparing the structure of a primary shoot from (A) a monocot and (b) a eudicot.
Video: Acid-base imbalances - metabolic acidosis and alkalosis

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