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The human body produces and destroys 15 million blood cells every second.
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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.
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There are 20 feet of blood vessels in each square inch of human skin.
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The horizontal fraction bar was introduced by the Arabs.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.