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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.

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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.

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Eating food that has been cooked with poppy seeds may cause you to fail a drug screening test, because the seeds contain enough opiate alkaloids to register as a positive.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.

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