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Did you know?

A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.

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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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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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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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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

Acromegaly in one individual from a pair of identical twins. Acromegaly in one individual from a pair of identical twins.
In a project on job discrimination, Pager prepared identical résumés for the teams, but with one ... In a project on job discrimination, Pager prepared identical résumés for the teams, but with one ...
Branched-chain amino acid oxidation, fatty acid b-oxidation, and the citric acid cycle share a commo Branched-chain amino acid oxidation, fatty acid b-oxidation, and the citric acid cycle share a commo
Share of Hours Worked by Education Level, 1940–2008 Share of Hours Worked by Education Level, 1940–2008
Identical twins (monozygotic twins) have the same sex and share a single genotype. Identical twins (monozygotic twins) have the same sex and share a single genotype.
Traits Bacteria and Archaea Share Traits Bacteria and Archaea Share
Video: Cerebral Cortex Animation

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