Why doesn't your brain allow you to know what's going on inside it? Neuroscientist David Eagleman attempts to answer that, and proposes a new approach to criminal justice.
He also cites the example of Mel Gibson to address the question of whether prejudices are hard-wired into our brains.
David's latest book (following on from the phenomenally succesful Sum) is Incognito: The Secret Lives of the Brain.
Brian Greene poses this week's "Hannaford question" - the question that he would most like to see answered by science.
We're about to climb on board Vostok 1 and hitch a ride alongside Yuri Gagarin exactly 50 years to the second since he made history. Dr Christopher Riley tells us about his new film First Orbit which will be launched at exactly the same moment five decades after Vostok 1 blasted off.
You can watch it at 7.07am on Tuesday 12 April at guardian.co.uk/science or on YouTube. Use the hashtag #orbit1 to join the conversation on Twitter and follow events in the run-up to the launch and during the flight.
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