Science broadcasting at its finest.

In Our Time on BBC Radio 4, a weekly discussion on the history of ideas. IOT does science superbly, and todays was among the best: 45 minutes of conversation about the Permian-Triassic extinction with three academics who knew their stuff and could talk about it in a clear, understandable way without patronising or over complicating. Brilliant, brilliant and the generous BBC lets you listen again or download as a podcast. Which you should. Why highlighted here? Because part of the discussion covers evolution in the aftermath of of a big wipeout, including a lovely phrase about the survivors: 'dead clay walking'. Now clear off and listen to it.