Alan Weinstein and the triple blind proof black hole collision.

Professor Alan Weinstein, who leads a group of scientists at Caltech who work on the Laser Interferometer Gravitational-Wave Observatory (LIGO), gives Griff, Kevin and Jimmy, their own special look at the ground-breaking announcement of the discovery of a 1.3 billion year old collision between two large black holes detected solely from their subtle waves in the fabric of space and time.