Discovery: Lost in the Dark

Physics is getting a good understanding of atoms, but embarrassingly they're only a minor part of the Universe. Far more of it is made of something heavy and dark - so-called dark matter. The scientists who discovered the Higgs boson 10 years ago thought they'd also create dark matter in the underground atom smasher at Cern. Roland Pease joins them as they redouble their efforts at the upgraded Large Hadron Collider, and travels to Gran Sasso in Italy where subterranean telescopes hope to see dark matter streaming through the Galaxy