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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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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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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.