
But it's not a new program (first broadcast in 2010), so it should be (and is) available on-line. It's repeated in the wee small hours tomorrow morning (23rd August), at 0300 hours. Presented by Professor Jim Al-Khalili, yet another in the team of first-class BBC science presenters.
Try and catch this one if you can - you won't regret it.

I didn't check to see if there was a thread on this already, what with the current gremlins.