Does a metal implant turn a person into a living lightning-conductor or radio receiver, is eye-size important, why is frost bad for freezers, where did the first organic molecules come from, what happens to sparkling drinks in space and why does a bump on the head make you see stars? This week, join Chris, Sarah and Dave as they pit their wits against the latest crop of your top questions. Plus, why making new computer chips looks set to become easy PC, how stem cells can get to the heart of Long QT Syndrome, feeding the world in 2050 and a new musical device to keep the drummer in the driving seat...