Mouthguard technology, space junk and Is it time to stop changing the clocks?

Dr Chris Smith and the Naked Scientist team present the latest science news, analysis and breakthroughs.In this week's episode...the mouthguard technology that is helping tackle head knocks in sport. We’ll assess the impact that space junk is having on our atmosphere. It’s that time of year again. As many parts of the world prepare to change their clocks, we’ll examine the case for doing away with the practice altogether.Get the podcast from the BBC Sounds app.