Dust is a part of our lives, but how much do we know about it, and what it is made up of? Claire investigates this seemingly innocuous part of life.Also this week, Stu introduces us to geneticist George Price, whose equation is used by evolutionary genetics to predict how useful a genetic trait will be for a population.And Chris speaks to physicist Dr Magdalena Zych about her research designing a quantum update of one of Galileo's famous experiments.