If you burn your Pizza to a crisp, are you're left with a low calorie (if not very tasty) meal? In this Question of the Week we find out whether cooking contributes calories to a dish, or turn your lunch into the slimmers option. Plus, we ask if a second bolt of lightning would act as a defibrillator and re-start your heart after A first strike had stopped it, and ask why copper comes in countless colours? Like this podcast? Please help us by supporting the Naked Scientists