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There are more nerve cells in one human brain than there are stars in the Milky Way.
The familiar sounds of your heart are made by the heart's valves as they open and close.
Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.
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.
Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.