Why might cataract surgery affect biometric logins?

This week's Question of the Week comes in from listener David, who asks:'On the show 'Tipping Point', Often at the end they play out the final three counters as 'What would have happened.' Would the result actually be what would have happened?Thanks to Tony Padilla for the answer! Like this podcast? Please help us by supporting the Naked Scientists

Thanks to Bencie Woll and Victoria Mousley for the answer! Like this podcast? Please help us by supporting the Naked Scientists

Thanks to University of Cambridge's Ben Allanach for the answer! Like this podcast? Please help us by supporting the Naked Scientists

Steve has written in to us to ask whether the order in which one eats their food makes a difference to whether or not they experience glucose spikes. We thought this was an interesting question for Cambridge Professor Giles Yeo to sink his teeth into... Like this podcast? Please help us by supporting the Naked Scientists

Thanks to Andrew Bremner for the answer! Like this podcast? Please help us by supporting the Naked Scientists

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Thanks to Dr John Bissell for the answer! Like this podcast? Please help us by supporting the Naked Scientists

Thanks to Rod Mitchell for the answer! Like this podcast? Please help us by supporting the Naked Scientists

Will Tingle takes on this head scratcher from listener David with the help of Professor Adam Taylor of the University of Lancaster... Like this podcast? Please help us by supporting the Naked Scientists

Thanks to UCL's Mark Maslin for the answer! Like this podcast? Please help us by supporting the Naked Scientists