No longer one of a kind: Smithsonian makes copies of artifacts using 3D printer to lend them to other museums
Colgate Plaqless Pro The toothbrush that tells you when your mouth is clean Sarah Tew/CNET Smart toothbrushes are all about coaching you through each brushing session to get your mouth as clean as possible. What makes Colgate's Plaqless Pro brush stand out is a sensor right below the bristles that looks for plaque and know when it's gone as you brush.