This isn't entirely /sci/ related but I think this is the best place to ask.
I remember like a year ago someone made a thread here about radioactive material and in the thread someone linked a site where you can buy some weakly radioactive rocks. I was wondering if anyone has a link to that site again (and any other sites where you can buy such material).
To be honest I also don't know much about safe levels of radiation, I just want some of the stuff out of curiosity/for fun. Can anyone advise me on what I should look out for to make sure I'm not buying anything too dangerous?