I listened this morning to a fascinating discussion on the origins of infectious disease in an episode of Melvyn Bragg's normally stunning dull "In Our Time". It's now available to listen to online, here. I know that it's not available in at least some countries outside the UK. Here's the programme blurb: It was so interesting it made me think I should read A Planet of Viruses by Carl Zimmer. Here it is on US Amazon (where there are more reviews than on UK Amazon and where there's a "look inside" feature so you can peek).