![Amos Winter: The cheap all-terrain wheelchair](https://pi.tedcdn.com/r/talkstar-photos.s3.amazonaws.com/uploads/23319dea-5ed4-4afa-bff2-edc476974ba5/AmosWinter_2012X-embed.jpg?h=200)
How do you build a wheelchair ready to blaze through mud and sand, all for under $200? MIT engineer Amos Winter guides us through the mechanics of an all-terrain wheelchair that's cheap and easy to build -- for true accessibility -- and gives us some lessons he learned along the road.