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The 80th birthday celebrations of the late, great Queen frontman Freddie Mercury have us marvelling at mercury at an elemental level: as a killer, a cure and more. First, we hear about how to make a telescope mirror out of a spinning bowl of liquid mercury. Then we hear about killer queens; it’s a gruesome tale of pheromone-induced ant warfare. Next, Freddie’s rare condition that caused him to have four extra incisors in his upper jaw leads us to discuss the secrets hidden within our teeth. We’re joined by archaeologist Carolyn Freiwald from the University of Mississippi, whose work on the teeth of ancient people tells us much about both their lives and our own. Also, the secret to getting rid of earworms, ancient civilisations hidden beneath the Amazon, and why you should never mess with dimethyl mercury. Presenter: Marnie Chesterton, Kai Kupferschmidt and Camilla Mota Producer: Lucy Davies, Alice Lipscombe-Southwell, Imy Harper and Debbie Kilbride