Several months (years?) ago, I read a story on the net about a government project that was deciding how to mark nuclear waste disposal sites so that future cultures would understand that they are "bad places." The investigation potion of the process is finished and the reports are available online. This is absolutely fascinating stuff. The two reports are contained in the last two appendices -- the report background is interesting too, but the most fascinating stuff is in the back. Here it is. I suspect that any gamer would find this of interest.