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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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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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There are immediate benefits of chiropractic adjustments that are visible via magnetic resonance imaging (MRI). It shows that spinal manipulation therapy is effective in decreasing pain and increasing the gaps between the vertebrae, reducing pressure that leads to pain.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.