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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.
The familiar sounds of your heart are made by the heart's valves as they open and close.