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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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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.

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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.

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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.

Humans have 23 pairs of chromosomes, containing 3 billion “letters” in the DNA code and about ... Humans have 23 pairs of chromosomes, containing 3 billion “letters” in the DNA code and about ...
4.1 Age changes in total IQ based on cross-sectional data (lower line) and longitudinal data ... 4.1 Age changes in total IQ based on cross-sectional data (lower line) and longitudinal data ...
The lower intake manifold attaches to the cylinder heads. The lower intake manifold attaches to the cylinder heads.
Find an equation of the tangent line to the graph of f(x) = sqrt(x) / (x+1) at the point x=1 Find an equation of the tangent line to the graph of f(x) = sqrt(x) / (x+1) at the point x=1
The Lower Extremities The Lower Extremities
Number line for rounding Number line for rounding
Video: Mycobacterium tuberculosis: Drug Resistance and Natural Selection

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