If you're interested in photography it's likely you know this photograph. What you may not know is the story of the people behind it; Edward Crawford, who's throwing the tear gas canister and Robert Cohen, the photographer. The story is told in a recent episode of the excellent Criminal Podcast.

I have, I'm aware, a tendency to get a little obsessive about things I like. I'm also aware this may get 'a little' boring for those around me, as I preach on the subject of my latest obsession. Which, ironically, I realise is exactly what I'm about to do here. I can't help it. I'm so convinced that you'll join me at the heights of appreciation, as soon as you know about 'the thing', that you'll forgive the pushing and cajoling that's caused you to relent.

I think I've mentioned here before the excellent Documentary Review Podcast. Actually it occurs to me that by saying 'I think' I may give you the impression that I've been too lazy to check. I'm not taking you for granted, dear reader. It's just that, well, I suspect that I may not have mentioned it before, which would, I'm afraid, have been dreadfully remiss of me.