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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
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The longest a person has survived after a heart transplant is 24 years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.
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The horizontal fraction bar was introduced by the Arabs.