This week, do diet foods make children fat? Could a space screw save us from catastrophe collisions? Have we seen the last of the Yangtze river dolphin? And should we look to the Simpsons for our science? Writer Al Jean explains that, despite the three eyed fish and three fingered hands, it's one of the most science literate shows on television. Also, as it's our Summer Special Question and Answer show we tackle your questions ranging from rising cakes to rising heart rates, why the moon looms larger on the horizon and why magnets make bad television. Plus, in kitchen science we investigate the mystery of Mr Matey's colour changing bubble bath!