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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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.
When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
The familiar sounds of your heart are made by the heart's valves as they open and close.