Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green.
As we enter mid-August, millions of people will load up the car and head out to the beach for summer vacation. But no matter how much energy you put into building a sandcastle, it's unlikely to be as impressive as the structures produced by Stone Spray, a solar-powered, robotic 3D printer that can create entire buildings out of sand. It's hard to deny that 3D printing has the ability to change the world -- especially after learning about a two-year-old girl who gained the use of her arms with the aid of a 3D-printed robotic exoskeleton (she calls them her "magic arms").
