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Did you know?

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).

Did you know?

After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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

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The horizontal fraction bar was introduced by the Arabs.

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There are 60,000 miles of blood vessels in every adult human.

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Video: Normal and abnormal blood pH

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