For 50 years, the astrophysicist Martin Rees has contributed to our understanding of cosmology. Now he is speaking up about the promise and potential dangers of the science and technology that will arrive over the next 50 years and beyond.
About the author
Claudia Dreifus is a regular contributor to The New York Times and The New York Review of Books. She also teaches one of the first ever courses on science journalism for scientists at Columbia University's Earth Institute.