It's a pretty disgusting episode of the Fun Kids Science Weekly! Science presenter and comedian Steve Mould is on the phone sharing some of his favourite science stories and facts. Steve explains why our eyes sometimes twitch and tells us about how fleas pass diseases on to humans... by vomiting on them! 

If that wasn't gross enough, we also discover where poo goes after it's flushed down the loo with Bene and Mal. Plus, meet Santamory - the elf in charge of science and technology at the North Pole - who explains how the elves have made some clever improvements to Santa's sleigh to make sure it's aerodynamic.