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There are 60,000 miles of blood vessels in every adult human.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
There are more bacteria in your mouth than there are people in the world.
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.
Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).