Wouldn’t it be great if you could lose weight and stay fit just by exercising your brain? Trouble is everything takes so much effort - from burning off excess weight to powering our cars. But why?

Presenter Marnie Chesterton rummages through the CrowdScience inbox to tackle all your energy-expending queries. Is the entire universe spinning? How much energy do we expend when sleeping? Can I think myself thinner? Scientists Helen Czerski, Andrew Pontzen and Andrea Sella join listeners from around the world to discover how effort and energy affect our lives.

(Image: A young boy sits at an office desk searching for successful ideas using a homemade thinking cap with a lit up light bulb. Credit: Getty Images)