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I am looking for a National Geographic documentary about inventors. It is a very old video probably from the 80s. I remember it starts showing some kids and their inventions, one of connected a rake to a bike in order to sweep the leaves faster. The documentary ends with the history of the laser.

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I found it, the name is National Geographic Specials Miraculous Machines (1985).

http://www.imdb.com/title/tt0477047/

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If this is correct then mark it as the answer. It is perfectly fine to answer your own question. –  Kevin Howell May 21 at 17:24
    
Yes, I forgot to accept the answer. –  S182 May 25 at 23:33

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