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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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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).

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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.

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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

The difference between AZT-sensitive versus AZT-resistant reverse transcriptases The difference between AZT-sensitive versus AZT-resistant reverse transcriptases
Image of a blue whale's tail fluke with the Santa Barbara Channel Islands in the background, Au Image of a blue whale's tail fluke with the Santa Barbara Channel Islands in the background, Au
The salivary glands, parotid, sublingual, and submandibular. This image shows the position of each g The salivary glands, parotid, sublingual, and submandibular. This image shows the position of each g
Obstetrical sonography and fetometry. (b) An ultrasound image reveals the fetus within the uterus. Obstetrical sonography and fetometry. (b) An ultrasound image reveals the fetus within the uterus.
Picture graph Picture graph
Video: baroreceptors

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