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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
There are more nerve cells in one human brain than there are stars in the Milky Way.
Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.