In this episode of Naked Genetics: The risk factors between schizophrenia and substance use disorder have had a fresh genetic examination; I put Illumina to the test and ask, 'what difference does washing our hands really make?' And, the the extraordinary way in which dung beetles use the night sky to orientate themselves... Like this podcast? Please help us by supporting the Naked Scientists

Dr Chris answers listener submitted questions including: would it be possible to slingshot continuously around the Earth and Mars? When does our consciousness 'switch on?' How worried should we be if we're outside during a thunderstorm? Is 0 positive or negative? What maintains our body temperature? Like this podcast? Please help us by supporting the Naked Scientists

Phil sent in this quantum conundrum which Will Tingle took on with the help of Ben Allanach, Professor of Theoretical Physics at the University of Cambridge... Like this podcast? Please help us by supporting the Naked Scientists

Was the Space Shuttle fundamentally flawed? Richard Hollingham talks to Adam Higginbotham, author of a new book on the Space Shuttle to discuss the design, the dream, and the wishful thinking that led to the Challenger and Columbia disasters. Sue Nelson visits London's Design Museum to visit a new Barbie exhibition and talk "Space Barbie". Also, discussions on the future of the International Space Station, Star Trek: The documentary, and betting on smarties. Like this podcast? Please help us by supporting the Naked Scientists

Thanks to Garth Jenkins from the University of Glasgow for the answer! Like this podcast? Please help us by supporting the Naked Scientists

Do women suffer from flatulence, and what affects your level of flatulence? Does hitting someone on the head actually knock them out? Is being a psychopath down to nature or nurture? Why does the weather stay warm when the seasons shift? Why can we only recycle some types of plastic? Can a swollen heart be reduced in size? Can nuclear rods power spaceships? Can mattresses and pillows reduce snoring? Dr Chris Smith and Clarence Ford have all the answers... Like this podcast? Please help us by supporting the Naked Scientists

Does laying on your left side clean your organs? Are faces the only difference that different populations have, and why do we notice facial differences? What happens to the body when your body drops drastically? How does the body react to extreme trauma? Why do we get blemishes on our skin? Could you transplant muscles around the body? How do you seek help after a suspected rabies bite? Dr Chris Smith and Krystal Orderson have all the answers... Like this podcast? Please help us by supporting the Naked Scientists

Brian has been in touch to ask whether stars can be independent of galaxies. James Tytko asked the University of Cambridge's public astronomer Matt Bothwell to help find the answer... Like this podcast? Please help us by supporting the Naked Scientists

For today's question, James Tytko takes on Janey's query on the shape of modern wind turbine blades and draws a comparison with old fashioned windmills: why such different designs? Professor of Renewable Energy Simon Hogg from Durham University provides the answer... Like this podcast? Please help us by supporting the Naked Scientists