Ask the Naked Scientists

The cause of a blood red moon, is there an upper limits for temperature, where does the Sun's hydrogen come from, what does a blind person see in their mind's eye, and are e-cigarettes safer? Join Dr Chris Smith as he tackles the top questions sent in to Talk Radio 702... Like this podcast? Please help us by supporting the Naked Scientists

How does acid produce stem cells? Why do carpets creep across the floor? Where does dust come from? Why can't flying insects escape from the surfaces of swimming pools? Do women multitask better than men? What is andogenic alopecia? Do we sneeze when we are asleep? What's special about graphene? And is nutritional data on food labels reliable? Like this podcast? Please help us by supporting the Naked Scientists

How does light accelerate in a less-dense medium? How do climbing plants twist around a stake? Did people share technology 5000 years ago? Why would stainless steel rust? And why does mango chutney make my underarms smell after I've eaten it? Like this podcast? Please help us by supporting the Naked Scientists

What's the difference between GM technology and cloning? If lightning hits a swimming pool, would a swimmer be fried? What happens when we get used to smells? Why does beetroot make urine red? Why do I stick out my tongue to concentrate? Where does the water in comets come from? What are the products of fuel combustion? Like this podcast? Please help us by supporting the Naked Scientists

How is the scale of a coronal mass ejection (CME) measured? How does evolution work? Why is sole and palm skin a lighter colour? What causes magnetic field flips? What are blood groups and do animals have their own blood groups? Join Dr Chris for this week's crop of questions from Talk Radio 702, South Africa... Like this podcast? Please help us by supporting the Naked Scientists

How trees tell the time, the germ potential of hot air driers in toilets, where fruit flies come from, does menstruation synchronise, why do mad people tend to run along roads, why is smoking addictive and why should a 7-year old have underarm odour? Join Dr Chris for the first Ask! outing of 2014... Like this podcast? Please help us by supporting the Naked Scientists

Plant and tree gender, omega-3 fatty acids and cancer and the science of sous vide cooking... Like this podcast? Please help us by supporting the Naked Scientists

Why tugging on nasal hairs causes crying? What triggers static shocks? Why are computers based around binary? What are blood groups? How can babies have 3 parents? Why is yawning contagious? What happens to excess skin when a person slims? When is a hot bath too hot? Why are some infections more common in winter? Like this podcast? Please help us by supporting the Naked Scientists

What colour were human ancestors? What does a rocket push against in space to propel itself forward? Why does yawning make me cry? How do bats navigate? Can fuel cells run on alcohol? Why are 90% of people right handed? How genetically related would the children of two sets of identical twins be? Plus, noses grown on foreheads and how rotating antibiotic drugs can prevent bacterial resistance... Like this podcast? Please help us by supporting the Naked Scientists

Why scratch your head if you don't know the answer? What about the Earth made the dinosaurs so big? Why does the Universe spin? Is the Sun seem brighter in the morning than the evening? Are autistic people particularly at home with computers? Why do effervescent tablets fizz only in water? Why do Parkinson's patients sleepwalk without difficulty? Plus, news of a decoy molecule that can treat dwarfism and what earwax has revealed about blue whales... Like this podcast? Please help us by supporting the Naked Scientists