Shockingly enough, we continue our series on electricity from last week. This time we look at how batteries and power stations work - the information will be conducted right into your brain. Don't bother to insulate yourself, you know you can't resist.

Lawrence Krauss wrote the book on the physics of Star Trek. We talk to him about stuff including time travel, 'warp' drives, negative energy, dark energy, the transporter and the tricorder. So much fun packed into such a short space of time - it's a singularity of awesomeness.

Our continuing mission is to have a quiz at the end of each show.