For Christmas I was given a book, Canning, Freezing, Storing Garden Produce (1977) published by the US Department of Agriculture. It is an excellent guide. I highly recommend it. It isn’t over cautious like many of the books of this kind, and it explains some of the reasons why you should heat process pickles (something I haven’t done but I will consider doing now).
Like all books of this kind, it talks a lot about botulism. Botulism occurs when non-acidic fruits and vegetables are not processed correctly. In this guide they say that one cup of botulism is enough to kill the entire world. It reminds me of a home economics class. The instructor said that one cup of licorice extract was enough to colour the great lakes.
Just one cup and the world ends and the lakes turn a waxy black shade.