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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).
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.
After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
On average, the stomach produces 2 L of hydrochloric acid per day.