New techniques to test for Down's Syndrome and oesophageal cancer feature in this week's Naked Scientists, along with the nanotechnology that may let you climb walls like spider man! We also take on your science questions and find out if it's possible to shoot a satellite, what keeps the Earth's core so hot, and how you can pass through fire unharmed! Plus, in a back-to-basics Kitchen Science - Dave makes drops of milk bounce out of his tea! Like this podcast? Please help us by supporting the Naked Scientists