Do you ever run out of sperm?

Jimmie sends in this week's question, seeking an answer as to why plastic loses its flexibility. James Tytko took on the question with the help of Chemistry World's Phillip Broadwith... Like this podcast? Please help us by supporting the Naked Scientists

Thanks to Professor Heather Graham for the answer!This episode of Question of the Week, listener Donald asks:"Assuming mosquitoes have taste buds, then they should have adverse tastes. Have molecular scientists explored how to make or find chemicals that make mosquitoes disgusted?"Will - As someone who's about to head off to a particularly mosquito-heavy part of the world, I too would find great reassurance in knowing that I was using the most effective means of preventing a mozzie bite. Paul on the forum is thinking long term and says 'there is hope that current experimental malaria vaccines... Like this podcast? Please help us by supporting the Naked Scientists

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

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

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