Evolution's luxury item

You're a mammal. I'm a mammal. Your pet cat or dog is a mammal, as are whales, lemurs, pandas and polar bears. But what exactly is a mammal, and what can our genes tell us about our evolution? Plus, school students take on the whipworm genome, the surprising genetic diversity of Papua New Guinea, and a gene of the month that's up all night. Like this podcast? Please help us by supporting the Naked Scientists