Science is often portrayed as an obscure, difficult discipline, governed by elite researchers and inaccessible to the general public. In this riveting, inspiring new book, preeminent astrophysicist Martin Rees overturns this view, urging improved communication between researchers and laypeople. In order to shape debates over health care, energy policy, space travel, and other vital issues, ordinary citizens must develop a feel for science, the one truly global culture, and engage directly with research rather than relying on pundits' and politicians' interpretations. Recognized as an expert on the political and ethical impacts of science, Rees demonstrates how we must solve the new challenges we face, from population growth to climate change, by devising strategies with a long-term, global perspective. In the process, he offers insights into the prospects for future discoveries while also explaining science's intrinsic limits. Just as importantly, Rees reminds us that science should be a source of pleasure and wonder, for specialists and nonspecialists alike.