Boards
Man-made disasters
Here's a few for starters to dissect and discuss:
http://en.wikipedia.org/wiki/Chernobyl_disaster
http://en.wikipedia.org/wiki/Banqiao_Dam
http://en.wikipedia.org/wiki/Bhopal_disaster
http://en.wikipedia.org/wiki/Great_Smog_of_1952
http://en.wikipedia.org/wiki/MV_Do%C3%B1a_Paz
http://en.wikipedia.org/wiki/Johnstown_Flood
Got any others you'd care to bring to the disaster discussion table?