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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.

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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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Excessive alcohol use costs the country approximately $235 billion every year.

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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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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.

A laboratory experiment verified evaporative cooling by the cicada, Diceroprocta apache A laboratory experiment verified evaporative cooling by the cicada, Diceroprocta apache
Continuous, Absorption Line, and Emission Line Spectra Continuous, Absorption Line, and Emission Line Spectra
Miller-Urey Experiment Updated Miller-Urey Experiment Updated
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
Elements of an Experiment Elements of an Experiment
A Mental Model of the Craftsman Experiment A Mental Model of the Craftsman Experiment
Video: Magnetic resonance imaging (MRI)

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