Why don't microwaves spark off themselves?

The Naked Scientists tackle your questions, from how hail storms come about to why the Mediterranean Sea has such small tides. And why do people often favour walking on one particular side of the road?Plus, we look at what science might hit the headlines in 2014, from China's ambitions for manned spaceflight, to new graphene-based electronics. Like this podcast? Please help us by supporting the Naked Scientists