Summary: This week, Chris Smith and Izzie Clarke are taking you to the cutting edge of materials science including how blacksmiths made incredibly tough swords to how defence scientists make bullet-proof armour today. Plus, news of a better way to manage prostate cancer, how fingerprints might replace chip n pin, and how scientists are using cold lightning to keep fruit fresh for longer. For more podcasts by The Naked Scientists, head to nakedscientists.com, find @NakedScientists on Facebook, Twitter and Instagram and subscribe to "The Naked Scientists" on your favourite podcast app. **Edinburgh Science Festival** Do you want to see The Naked Scientists LIVE at the Edinburgh Science Festival? We're recording our podcast (fully clothed!) in front of a live audience on Sunday 7th April and want YOU to be there! To grab your tickets, head to sciencefestival.co.uk and search for The Naked Scientists. For information regarding your data privacy, visit <a href="https://www.acast.com/privacy">acast.com/privacy</a>
