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Cocaine was isolated in 1860 and first used as a local anesthetic in 1884. Its first clinical use was by Sigmund Freud to wean a patient from morphine addiction. The fictional character Sherlock Holmes was supposed to be addicted to cocaine by injection.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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.
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.
Green tea is able to stop the scent of garlic or onion from causing bad breath.