Ivory soap slogan "99-44/100% Pure" was cleverly invented by Harley Proctor who with the help of chemists determined that Ivory soap was only 56/100 pure. Proctor simply subtracted 56 from 100 and came up with "99-44/100% Pure".

George Washington had teeth made out of hippopotamus ivory.

Scientists with high-speed cameras have discovered that rain drops are not tear shaped but rather look like hamburger buns.

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