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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.