How do we cope at the extremes of low temperature? Across the world, groups of people have historically made their home in icy and inhospitable landscapes... and even today, groups of thrill seekers push their bodies to the limits by going swimming in water close to freezing. In this month's programme, genes that help us handle - and even enjoy - being very cold. We've got two stories from the ancient ice, including the oldest ever DNA; plus, two modern genes found to be helping us out in interesting ways, whenever things get particularly chilly... Like this podcast? Please help us by supporting the Naked Scientists