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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.

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There are more sensory neurons in the tongue than in any other part of the body.

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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Elderly adults are at greatest risk of stroke and myocardial infarction and have the most to gain from prophylaxis. Patients ages 60 to 80 years with blood pressures above 160/90 mm Hg should benefit from antihypertensive treatment.

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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.

Rutherford's gold foil experiment demonstrating that most of the volume of an atom is empty spa Rutherford's gold foil experiment demonstrating that most of the volume of an atom is empty spa
Functional MRI Scans These scans of human brains show localized average increases in neural activity Functional MRI Scans These scans of human brains show localized average increases in neural activity
In-line blending is the most accurate method for blending ethanol with gasoline because computers ... In-line blending is the most accurate method for blending ethanol with gasoline because computers ...
Gently squeeze the tissues along the eyebrow line between your thumb and forefinger. Begin at the ... Gently squeeze the tissues along the eyebrow line between your thumb and forefinger. Begin at the ...
Monkey Experiment: Sense of Fairness Monkey Experiment: Sense of Fairness
In a double-slit experiment, the slit separation is 1.75 mm, and two coherent wavelengths of ... In a double-slit experiment, the slit separation is 1.75 mm, and two coherent wavelengths of ...
Video: Methods of carbon dioxide transport - carbaminohemoglobin and bicarbonate ions

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