Dan Romik, chair of the Department of Mathematics at UC Davis, used 3D printing to come up with a new theory in the "moving sofa problem," which was first introduced in 1966. Basically, how big is the biggest sofa that can be moved around a hallway corner without moving or tilting it? If you didn't know that mathematicians have been tormenting themselves with this question for decades, you're not alone, but the way Romik approached solving it is quite ingenious - and comes with free 3D printable files! Read more at 3DPrint.com: http://3dprint.com/168718/moving-sof...m-3d-printing/