So this is the 20th Anniversary of the biggest nuclear accident ever. Well I think that’s what the news is saying. I certainly remember it being pretty shocking at the time and that we were vaguely worried that a large nuclear cloud would drift over and kill us. I don’t actually remember being as young as I must have been, though, which is peculiar. Looking back over much of the Cold War period seems a little unreal: the threat of terrorism probably seems more scary now than the possibility of a nuclear war did, and I remember that being something that worried me a lot, given I was quite young.