321 super smart things you absolutely have to know

Did you know that a giraffe can lick its own ears? And that astronauts pee in vacuum cleaners? That oranges are a cross between grapefruit and tangerine and were originally green? That ketchup used to be medicine and sea cucumbers are not related to cucumbers? And that there are fish that live on trees? Or that there was a living model for Barbie and blue blood actually exists? 321 fun and surprising facts from all walks of life, wittily illustrated and to the point, offering new insights not only for children. An aha experience for all who like to brag about unusual knowledge.