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In most climates, 8 to 10 glasses of water per day is recommended for adults. The best indicator for adequate fluid intake is frequent, clear urination.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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The FDA recognizes 118 routes of administration.

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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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