On this weeks Ask the Naked Scientists we discuss why stinging nettles cause so much pain, why you should keep your bananas apart, and tell you about the effects and symptoms of asbestosis. We also find out which of our favourite foods were discovered in the Americas, if lightning occurs on other planets, why the new digital radios use up more electricity, and how a greenhouse works. All that and more of your questions answered on this weeks podcast. Like this podcast? Please help us by supporting the Naked Scientists Like this podcast? Please help us by supporting the Naked Scientists