Lego builder Eric Steenstra built a fully functional go-kart made entirely out of Lego bricks, and in an inspiring story, artist and wheelchair user Sue Austin created a self-propelled underwater wheelchair that allows her to glide through the sea.

ENGADGET: Inhabitat's Week in Green: go-kart made of Lego bricks, TOTO toilet bike and the launch of 'Willow Glass'