Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs. In this week's episode….how COVID -19 lockdowns affected the brain development of teenagers. Also, how best to dispose of dangerous nuclear waste and why the UK's puffin population is thriving, despite a rise in avian flu. Plus, why the appendix might be a lot more useful than we previously thought. Get the podcast from the BBC Sounds app.