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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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.
Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
Approximately 25% of all reported medication errors result from some kind of name confusion.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.