At the newspaper where I work, we used to have a frequent, anonymous caller we called "the Milkman." This was because his primary concern was the kids in schools getting irradiated milk. He had no evidence and no substantiation this was happening; he just "knew" it was. We looked into it, and there was no evidence of irradiated milk, but he was not deterred.
On another note, home food preservation is becoming a lost art. My mother used a pressure cooker to can beans and other vegetables, and also froze vegetables from the garden. This is probably an art that needs to be revived.