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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.