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Thyroid conditions may make getting pregnant impossible.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

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Recent studies have shown that the number of medication errors increases in relation to the number of orders that are verified per pharmacist, per work shift.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

Human immunodeficiency virus (HIV) Human immunodeficiency virus (HIV)
Human tongue Human tongue
Psychoactive substances: (left) Psilocybin is obtained from a species of mushroom; (right) LSD is ... Psychoactive substances: (left) Psilocybin is obtained from a species of mushroom; (right) LSD is ...
The human olfactory system. The human olfactory system.
Share of Human Capital in Wages in Developing Countries Share of Human Capital in Wages in Developing Countries
Australia's spiny anteater, one of only three modern species of monotremes Australia's spiny anteater, one of only three modern species of monotremes
Video: Role of transport in a cell

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