Question of the Week - From the Naked Scientists

Van writes in with, 'A friend is encouraging me to take a cancer screening test that screens for many different cancers. A review of one test says: "While overall it picks up 90% of stage 4 cancers, it only detects an average of 17% of stage 1 cancers. Yet it is being touted as a test that can detect cancer early." Are these tests worthwhile?' James Tytko took on the question with the help of Professor Rebecca Fitzgerald, Founding Director of the Early Detection Institute at the University of Cambridge... Like this podcast? Please help us by supporting the Naked Scientists

If dinosaurs hadn't been wiped out by a mass extinction event, would there have been room for humans to grow into the successful species we are today? That's what Colin wants to know, and James Tytko has promised to find the answer. He spoke with Dr Charlotte Kenchington from the University of Cambridge's Department of Earth Sciences... Like this podcast? Please help us by supporting the Naked Scientists

This week, Carl writes in to ask whether he can be cured of specific musical anhedonia. This is a condition whereby a person can hear and distinguish between different types of music and the emotion they convey, but doesn't feel moved in the same way most people do. James Tytko took on Carl's conundrum with the help of Malinda McPherson, Assistant Professor at Purdue University's Department of Speech, Language and Hearing Sciences... Like this podcast? Please help us by supporting the Naked Scientists

Elizabeth with a transatlantic teaser for this question of the week: "I heard that people in the UK can't smell when it rains, but us Americans can. If I went to the United Kingdom, would I be able to smell the rain there? Would someone from the UK be able to smell rain here? What is going on?" James Tytko sought the answer with the help of Anne Jungblut from the Natural History Museum... Like this podcast? Please help us by supporting the Naked Scientists

Thanks to Professor Heather Graham for the answer!This episode of Question of the Week, listener Donald asks:"Assuming mosquitoes have taste buds, then they should have adverse tastes. Have molecular scientists explored how to make or find chemicals that make mosquitoes disgusted?"Will - As someone who's about to head off to a particularly mosquito-heavy part of the world, I too would find great reassurance in knowing that I was using the most effective means of preventing a mozzie bite. Paul on the forum is thinking long term and says 'there is hope that current experimental malaria vaccines... Like this podcast? Please help us by supporting the Naked Scientists

Regular listener, Mike, asked: "When tennis players are about to serve, they get a selection of balls. They seem to look at them and then select two to serve with. Now these are all new and good quality balls, how do they select the ones they like to use? Do they recognise them? Do they have favourites?" Very topical, Mike. Rhys James travelled to meet the tennis coach, James Hoad in Bury St Edmunds: Like this podcast? Please help us by supporting the Naked Scientists

Why is it that some mammals with small broods have the baby feeding apparatus near the upper limbs like humans and elephants and some near the lower limbs like cows and horses? As it turns out, this is a very good question. What dictates where the teats are on a mammal? The short answer is, well, no one is really sure, but that's not going to stop us from a bit of deductive reasoning and speculation. And one man who is up to the task is Queen Mary University of London's Chris Faulkes.Chris - We've got teats in the thoracic or chest region like humans, the sort of intermediate area or abdominal... Like this podcast? Please help us by supporting the Naked Scientists

Listener Kandi wrote into the Naked Scientists to explain the science behind this major medication method. "I have Hyponatremia as a result of a medication. How does a drug stop your body from using/absorbing the salt you consume?" Otis Kingsman spoke to Gerogetown University's professor of medicine, Joseph G Verbalis to find the answer... Like this podcast? Please help us by supporting the Naked Scientists

Listener Lara wrote into the Naked Scientists to ask "Is there a biological benefit for cats and dogs to bury their faeces? Can it help plants grow similar to horse manure?" Otis Kingsman spoke to the primary medical care director of the veterinary medicine company Linnaeus, Dr Simon Hayes, about this question on the fascinating function of faeces... Like this podcast? Please help us by supporting the Naked Scientists

Listener Alaster wrote in to ask "The electricals in my car stopped working after it was transported from Cape Town to the UK. I think there was a fault in the scanner in Cape Town. My question is, how does a car scanner work? Can it damage the electrical components within cars?" Julia Ravey presented this troublesome transport problem to Roger Worrall from the security company Westminster Group PLC... Like this podcast? Please help us by supporting the Naked Scientists

This week, Matt contacted us asking "With three space missions currently converging on Mars how do the nations avoid orbital collisions? Do they share data, do they have transponders or space traffic control etc?". Katie King spoke with Chris Bridges, academic at Surrey Space Centre in the University of Surrey to find out how we keep our spacecraft from colliding.... Like this podcast? Please help us by supporting the Naked Scientists

Daniel has been dreaming of the stars, but his dreams have been rather eerie. Now, he's on a one way journey to gain some scientific insight. He got in touch to ask 'If a crew on a mission to mars had a death on board, and if that body was released into space, would it ever decay?' Matthew Bothwell, public astronomer at the University of Cambridge, spills the beans on what would happen to human remains if they were ejected out into infinity and beyond... Like this podcast? Please help us by supporting the Naked Scientists