Radioastronomer Robert Wilson recalls a pair of pigeons who almost thwarted the discovery of cosmic background radiation. Wilson's discovery of cosmic background radiation, "the echo of the big bang", earned him a share of the 1978 Nobel Prize in physics.

The story of the evolution of life on earth during one photon's journey across the universe. Told by Saul Perlmutter who shared the 2011 Nobel Prize in physics for the discovery of the accelerating expansion of the universe.