This episode follows the Pop! show and is all about things that go pop, from music to bubbles. Helen, Matt and Steve crowd source an equation to describe the modern pop song (listen to the end for the song Helen created from this equation!), Matt takes a look at bubbles and the maths that underpins them and Steve creates some unusual sounds from balloons. Written and devised by Helen Arney, Steve Mould and Matt Parker. Produced by Ed Prosser.