Inhabitat's Week in Green: stair-climbing vacuum cleaner, carbon dioxide diapers and a real 3D-printed face

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. Just a few short years ago, 3D printing seemed like science fiction; we could grasp its value, but we didn't yet have the ability to harness its power and put it to good use. Now, we're seeing the technology advance every day -- and it's opening up new possibilities in medical science and other fields. This week, we shared the story of one British man who ...