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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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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.

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Persons who overdose with cardiac glycosides have a better chance of overall survival if they can survive the first 24 hours after the overdose.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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