A drawing from Michael Davidson's 2012 patent for "Toothbrush And Method Of Using The Same." Patent 8,108,962/U.S. Patent and Trademark Office hide caption

itoggle caption Patent 8,108,962/U.S. Patent and Trademark Office

NASA's Mars rover Curiosity dug up five scoops of sand from a patch nicknamed "Rocknest." A suite of instruments called SAM analyzed Martian soil samples, but the findings have not yet been released. NASA/JPL-Caltech hide caption

itoggle caption NASA/JPL-Caltech

Catherine Wong used electrical components to build an electrocardiogram that sends data by cellphone. Courtesy of Catherine Wong hide caption

itoggle caption Courtesy of Catherine Wong

Roger Angel, an astronomer at the University of Arizona, stands in front of his new project: a solar tracker. Angel wants to use the device to harness Arizona's abundant sunlight and turn it into usable energy. Jason Millstein for NPR hide caption

itoggle caption Jason Millstein for NPR

Adam Steltzner, the leader of the rover's entry, descent and landing engineering team, cheers after Curiosity touched down safely on Mars on Sunday. Bill Ingalls/NASA/Getty Images hide caption

itoggle caption Bill Ingalls/NASA/Getty Images

NASA engineer Adam Steltzner led the team that designed a crazy new approach to landing on Mars. Rachael Porter for NPR hide caption

itoggle caption Rachael Porter for NPR