The radioactive boyscout
I've never clicked one of those google news items that appear at the tiop of my email window before but today one caught my eye. "Swedish man's plans for home nuclear reactor spark alert". My initial reaction was that it was complete nonsense but I decided to investigate and discovered the radioactive boy scout who seemed to be on the right lines. I'm still not convinced that he could have amassed enough radioactive material from gas lanterns and smoke detectors but according to Mark Foreman's blog he was on the right track. This video gives the outline. According to Factsheets on biological and chemical warfare agents a smoke detector contains only 0.00000029 grams of Americium so more than 3 million will be needed to produce 1g.
If nothing else, the dubious nature of some of these links provides lots of material for a TOK discussion.