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

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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When Gabriel Fahrenheit invented the first mercury thermometer, he called "zero degrees" the lowest temperature he was able to attain with a mixture of ice and salt. For the upper point of his scale, he used 96°, which he measured as normal human body temperature (we know it to be 98.6° today because of more accurate thermometers).

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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

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All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

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Video: Structures that affect circulation - arterioles and vasomotor responses

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