Peter's first guest on I've Been Thinking is Professor Alice Roberts. Alice is a biological anthropologist, biologist, presenter and author. In this episode we look into the unbelievable amount of information that can be gleamed from bones, why the lives of ordinary citizens as well as those more famous figures in history are just as important and examining genes, we can trace human migration across the globe.

Alice's latest book, Ancestors is available now, and she can be found at www.alice-roberts.co.uk on via @theAliceRoberts on Twitter.

Peter can be found on Twitter @peterfrankopan

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Episode 2 of I've Been Thinking is with former head of the FBI, James Comey.

Produced, edited and mixed by @producerneil