Lawrence Krauss writing for New Yorker:
At rare moments in scientific history, a new window on the universe opens up that changes everything. Today was quite possibly such a day. At a press conference on Monday morning at the Harvard-Smithsonian Center for Astrophysics, a team of scientists operating a sensitive microwave telescope at the South Pole announced the discovery of polarization distortions in the Cosmic Microwave Background Radiation, which is the observable afterglow of the Big Bang. The distortions appear to be due to the presence of gravitational waves, which would date back to almost the beginning of time.
Watch Lawrence Krauss discuss the latest scientific discovery.