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The horizontal fraction bar was introduced by the Arabs.
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The longest a person has survived after a heart transplant is 24 years.
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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.