Jim Al-Khalili's Scipods

Jim Al-Khalili is a Professor of Physics and of the public engagement in science at the University of Surrey. Having discussed the making of his TV series Science and Islam and other scientific areas close to his heart in series 1 of his Scipods, Jim now explores some of the biggest questions in science with his 2nd series. Why does it get dark at night? What is Diracs equation? Is time travel possible? Do we have free will? What is dark matter, and why cant we detect it?