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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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.
If you could remove all of your skin, it would weigh up to 5 pounds.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.