When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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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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If you could remove all of your skin, it would weigh up to 5 pounds.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
A phylogenetic tree showing the major eukaryotic supergroups.
Hurricane Paths: Major Hurricane History
Descending limbs of Hadley cells are the sites of the world’s major deserts