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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.

The mark-recapture technique is often used to estimate population size. The mark-recapture technique is often used to estimate population size.
Sun size comparison Sun size comparison
Superior view of heart valves illustrating position, size, and shape of each valve. Superior view of heart valves illustrating position, size, and shape of each valve.
Vehicles equipped with onboard refueling vapor recovery usually have a reduced-size fill tube. Vehicles equipped with onboard refueling vapor recovery usually have a reduced-size fill tube.
Population size Population size
Sample Size Affects Sampling Error Sample Size Affects Sampling Error
Video: A Human Karyotype Preparation Animation

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