Castle Argghhh!!! has a hilarious update on the new SOF hand signals that you shouldn't miss. It reminded me of a humorous terrorism preparedness guide I had seen a couple of years ago. Well, as I was typing this, SubBasket called to tell me that my official written job offer just arrived, so I'd better home to check it out, rather than continuing the somewhat serious post on the dangers of being too afraid of potential terrorist attacks with low-level radiation weapons I had planned. (Short version: any terrorist attack using low-level radiation will cause many more problems from the panic than in actual damage, unless the public is first educated.)
Update1342 25 Feb: Moxie has an updated version of several of the terrorism preparedness guide placards I linked to above.