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Did you know?
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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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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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The horizontal fraction bar was introduced by the Arabs.