Does a cloudy day aggravate arthritis? Was the biblical flood real? How does a gastric bypass work? Will a knife in water go blunt? Where do the skeletons on sunken ships go? Why do cats have an extra fold of skin in their ears? And why transmit electricity at high voltage? Dr Chris joins Redi Thlabi for thirty minutes of quickfire Q and A... Like this podcast? Please help us by supporting the Naked Scientists

How did horse meat end up in the food chain? Is baking foil bad for you? How big are viruses? How are urine and sweat produced? How do hydrogen vehicles work? And how do we measure the height of things above sea level? Join Chris Smith for this week's crop of top questions from Talk Radio 702, South Africa. Like this podcast? Please help us by supporting the Naked Scientists

Why do ovaries run out of eggs and what affects egg quality? Why does diesel smell nice but burning engine oil is unpleasant? Do genes from genetically modified organisms get into eggs and sperm? Does lead affect behaviour? What causes motion sickness? Join Dr Chris for another run of science questions from South Africa... Like this podcast? Please help us by supporting the Naked Scientists

How does alcohol cause liver cirrhosis? Can we make matter massless by removing Higgs particles? How did spiders evolve web-making skills? What is insulin resistance? What does fluoride do? And do scars sustained by adults manifest in their offspring? This week Dr Chris takes on more questions from Talk Radio 702 South Africa. Like this podcast? Please help us by supporting the Naked Scientists

Are helium-filled balloons less likely to pop? How does a cordless toothbrush charge? Is there much mercury in compact fluorescent bulbs? Why do tired toddlers rub their eyes? Is lactose intolerance more common than it once was? And is it possible to trigger earthquakes artificially? Dr Chris answers this week's burning questions on Talk Radio 702, South Africa... Like this podcast? Please help us by supporting the Naked Scientists

What is involved in blood doping in sports? Can beetroot make urine red? Can mosquitoes transmit HIV? How do dung beetles use the Milky Way to navigate? Do sneezes stop your heart? Can you hear a supernova? Could plants grow on Mars? Why do ants keep drowning in my drink? Why do we not notice Earth turning? And can flour relieve burns? Dr Chris takes on another batch of top science questions from South Africa. Like this podcast? Please help us by supporting the Naked Scientists

How box jellyfish venom exerts its lethal effect, will the World end, how were the pyramids aligned, why does humid air feel hotter, why does a hot water stream slow after the tap is opened, what causes lights to twinkle, why do humans have language, is there a way to make more twins, where do stepped-on snails go, and why do diabetics sometimes smell like pear drops? Dr Chris tackles another crop of top questions... Like this podcast? Please help us by supporting the Naked Scientists

Carp with compasses, why we have earwax, what causes CIDP, can genes re-write their own code, do bananas in brown bags stay fresher longer, does hot water sound different, why veins look blue and what is coarctation of the aorta? Like this podcast? Please help us by supporting the Naked Scientists

Why do we age? Why do frogs end up in the swimming pool when it rains? Are mosquitoes attracted to some people more than others? What is epigenetics? What causes Bell's Palsy? How do frogs find water? Do tyres on the roof repel lightning? Answers to more great science questions from South Africa with Dr Chris... Like this podcast? Please help us by supporting the Naked Scientists

Do blood donors live longer, is water safe in plastic bottles, is Earth gaining weight and are space probes sterile? Plus, how fireflies have helped engineers make even brighter LEDs. Like this podcast? Please help us by supporting the Naked Scientists