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Did you know?

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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Patients who cannot swallow may receive nutrition via a parenteral route—usually, a catheter is inserted through the chest into a large vein going into the heart.

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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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Glaucoma is a leading cause of blindness. As of yet, there is no cure. Everyone is at risk, and there may be no warning signs. It is six to eight times more common in African Americans than in whites. The best and most effective way to detect glaucoma is to receive a dilated eye examination.

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The familiar sounds of your heart are made by the heart's valves as they open and close.

Insect species diversity on British host trees supports the area hypothesis. Insect species diversity on British host trees supports the area hypothesis.
St. John's Water Dog (Extinct) St. John's Water Dog (Extinct)
Olenoides erratus from the Mt. Stephen Trilobite Beds (Middle Cambrian) near Field, British Columbia Olenoides erratus from the Mt. Stephen Trilobite Beds (Middle Cambrian) near Field, British Columbia
Bill Viola, Room for St. John of the Cross. Bill Viola, Room for St. John of the Cross.
British Iron Production, 1600–1870 British Iron Production, 1600–1870
Video: Erythropoietin (EPO)

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