Can we accelerate as fast as a jet on a kiddies roundabout. Smash and grab – can a stock car team crack one of the world’s toughest safes. Would you bet your teeth on the laws of science. Resident Brainiac Boffin Jon Tickle takes to the water. How much weight can you lose by having a dump. Making chips – the lazy man’s way. Does a duck’s quack echo. How many times can you fold a piece of paper in half. Which commonly used household oil is the most dangerous. Why are you lighter on a morning than when you go to bed. We test subliminal advertising. And Fat v Thin continues.