Salim Nasser, engineer at NASA, won a $20,000 innovation prize this month for designing a wheelchair that does the reverse of a typical wheelchair. Instead of the occupant pushing in order for the chair to go, the occupant pulls. Pulling avoids the repetitive stress of injuries caused by pushing, using your arm and back muscles. This prototype contains specially designed wheels which can be attached to existing wheelchairs. Hopefully we will be able to see this product on the mass market. And because of its simplistic design I'm sure it will be cheaper than the electric models. Maybe by the time I'm old and grey wheelchairs will be molded off of this one. 
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