The Key to the Cosmos

S1, E2: Professor Jim Al-Khalili shows how, in our quest to understand the tiny atom, we unravelled the mystery of how the universe was created. A story with dramatic twists and turns, taking in world-changing discoveries like radioactivity, the atom bomb and the Big Bang, as the greatest brains of the 20th century competed to answer the biggest questions of all - why are we here and how were we made.