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11 avr. 2009

Living mathematics ...

Why do boomerangs fly?

"This is the 64,000 Euro question. First let me ask 10 fairly simple (but increasingly complicated!) related questions. If you can answer all of them, then you're well on the way to understanding how a boomerang works: try it !

... and some others very interesting things on this site as ...

Seven things everyone wants to know about the universe