The study of the origin and evolution of the universe has not always been regarded as science. It wasn't until the discovery of the cosmic microwave background (CMB) that the science of cosmology began to be truly recognized. In this video segment adapted from NOVA, learn how two researchers changed the future of cosmology when they stumbled upon radiation believed to be left over from the birth of the universe. This video is available in both English and Spanish audio, along with corresponding closed captions.