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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

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Disorders that may affect pharmacodynamics include genetic mutations, malnutrition, thyrotoxicosis, myasthenia gravis, Parkinson's disease, and certain forms of insulin-resistant diabetes mellitus.

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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Approximately 500,000 babies are born each year in the United States to teenage mothers.

Human immunodeficiency virus (HIV) Human immunodeficiency virus (HIV)
Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee. Primary visual processing areas (blue) in (a) human (lateral and mesial views) and (b) chimpanzee.
The uracil-binding pocket of human UNG The uracil-binding pocket of human UNG
Created Equal: A Social and Political History of the United States, Brief Edition Created Equal: A Social and Political History of the United States, Brief Edition
A colorized image of human chromosomes A colorized image of human chromosomes
Estimated times of divergence of human and Neanderthal genomic Estimated times of divergence of human and Neanderthal genomic
Video: Genetic distance between human groups

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