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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.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Methicillin-resistant Staphylococcus aureus or MRSA was discovered in 1961 in the United Kingdom. It if often referred to as a superbug. MRSA infections cause more deaths in the United States every year than AIDS.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.