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The human body produces and destroys 15 million blood cells every second.
Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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.
Asthma is the most common chronic childhood disease in the world. Most children who develop asthma have symptoms before they are 5 years old.

