Science Weekly: How the brain decides

On this week's show, there's talk of emotions and irrationality – no, not the Science Weekly team meeting – we talk to Jonah Lehrer, author of "The Decisive Moment", which tells us not only how our brains make decisions, but how we can learn to make better ones. Jonah reveals how our brains work when it comes to buying things, and why we feel less guilt when we spend on our credit cards. Cosmic inflation might sound like something the Chancellor of the Exchequer should be dealing with, but Professor Alan Guth explains why it actually means the universe is still expanding. According to Guth's theory, the early universe went through an initial phase of exponential expansion before condensing into the universe we see today.Olivia Judson joined us on last week's show to argue that scientists need to take more risks with their experiments. In a lecture last week, she...

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