Mark E. Davis, a successful chemical engineer, never dreamed that he would reinvent his career and create a revolutionary kind of cancer drug. But everything changed when his wife was diagnosed with breast cancer. 10 years later, IT-101, the nanoparticle drug he engineered, was approved for a six-month trial in humans. Also, meet a group of young, hopeful scientists who are setting their sights on a resource that provides enough energy in one hour to power the entire globe for one year-the sun. They believe they can create an “artificial leaf” that uses sunlight to split water into hydrogen and oxygen.