In anticipation of the 50th anniversary of NASA astronauts landing on the moon, Newsweek is spotlighting pioneers in science and technology, highlighting their very own moonshots and how they hope to change the world. As the CEO and co-founder of EpiBone, Nina Tandon is using stem cells and 3D printing to create living skeletal implants for those who need them. She wants to bypass the use of foreign materials, like metal and plastic, and harness the power of a patient's own body to create implants.