Scott Daigle, a graduate engineering student at the University of Illinois, looked at the wheelchair, then at the bicycle, and then back at the wheelchair and asked "Why not a gear system on a wheelchair?" Then he built one.
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Source: http://feeds.gawker.com/~r/gizmodo/full/~3/4wvoDgAQUJ4/intelliwheels-ags-shifts-the-wheelchair-into-a-higher-gear
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