Theoretical physicist Stephen Hawking is one of the world's leading scientists. In this programme, he explores the breakthroughs that are transforming people's lives in the 21st century. Joining Hawking are other leading scientific figures, including Sir David Attenborough, Richard Dawkins and Aarathi Prasad. They discuss how scientists are using technology to cure some of the world's most-common diseases and to expand our understanding of the universe. Other topics include how new technology, including 3-D printing and advances in space exploration, are shaping our future by changing the way we live.