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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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.

