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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.
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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The familiar sounds of your heart are made by the heart's valves as they open and close.