Question of the Week, from the Naked Scientists

• How do skin creams penetrate the skin?

  Garth wants to know, given the skin can block water from passing through it, how do certain skin creams allege to permeate into our body? James Tytko took on the question with help from Richard Guy, Professor of Pharmaceutical Sciences at the University of Bath... Like this podcast? Please help us by supporting the Naked Scientists

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  4:55
• Why does the distribution of lactose intolerance vary?

  Garth writes in wanting to know why the prevalence of lactose intolerance is nearly 100% in countries like South Korea, but down in the low single digits in countries like the UK. James Tytko asked Mark Thomas, Professor of Evolutionary Genetics at UCL, for the answer... Like this podcast? Please help us by supporting the Naked Scientists

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  5:19
• If I hadn't had any vaccinations, would I be here?

  Dan wants to know what the likelihood is of him being here if neither him, his parents, nor his grandparents had had any vaccinations. James Tytko sought to provide an answer, with the help of Helen Bedford, Professor of Children's Health at UCL... Like this podcast? Please help us by supporting the Naked Scientists

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  4:50
• How does the sun stay burning in space?

  Thanks to Philippa Browning for the answer! Like this podcast? Please help us by supporting the Naked Scientists

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  4:38
• Can bone conduction headphones damage your hearing?

  Bill sends his question in all the way from Australia. A regular listener, he enjoys our programme through bone conduction headphones. But what are these devices, and does listening to loud sounds through them predispose a person to damaging their hearing in the same way as traditional headphones? James Tytko seeks the answers, with help from audiologist Roger Lewin... Like this podcast? Please help us by supporting the Naked Scientists

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  5:29

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