Prostate cancer screening, and DNA building blocks in Bennu

On this week's news podcast, the former UK prime minister, David Cameron, calls for prostate cancer screening following his diagnosis. But does it really help to know you have the disease? Also, we find out about the DNA composition of the carbon-rich asteroid Bennu, the underlying cause of Santorini's recent earthquakes, and scientists discover where domestic cats came from... Like this podcast? Please help us by supporting the Naked Scientists (thenakedscientists.com/donate)