If you could remove all of your skin, it would weigh up to 5 pounds.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
Blank periodic table
True Friendship
Leaning against a table with a pillow for support.