The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The horizontal fraction bar was introduced by the Arabs.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
A true albino squirrel. Note the pink eyes.
true story
Comparison of interventions for nursing diagnosis
Which of the following statements is true of linkage?