Interviews and discussions with researchers en-us © 2007. Johns Hopkins University. All rights reserved. Baltimore, MD 21218, 443-287-9940 http://www.jhu.edu/news/ Elizabeth Tracey Interviews with the world's top researchers in the sciences, humanities and social sciences Great Ideas is a monthly podcast featuring Johns Hopkins University researchers and scholars in lively conversations about the most interesting ideas in the sciences, humanities and social sciences. Host Elizabeth Tracey asks the questions you'd ask if you could sit down with astronomers, economists, philosophers or historians working on the cutting edge of their disciplines. Thu, 12 Jul 2007 11:30:00 EST Poderator.com Johns Hopkins University Office of News and Information dgips@jhu.edu http://www.jhu.edu/news/podcasts/images/great_ideas.gif http://www.jhu.edu/news/podcasts Podcasts from the The Johns Hopkins University. Elizabeth Tracey JH astrophysicist Adam Riess discusses dark energy. It makes the universe grow at an ever-expanding rate. It accounts for as much as 70 percent of the energy/mass total in the universe. But it's only recently been discovered and no one really knows what it is. Astrophysicist Adam Riess discusses "dark energy." Riess led the team that published the first scientific paper on the phenomenon. Adam Riess, physics, physics and astronomy, dark matter Thu, 12 Jul 2007 11:30:00 EST