Jeez oh Pete, so spring is here, and it seems to have brought along the first “canning is dumb” article. This year it’s at Slate, where last summer, it was at Salon. I’ve addressed this subject once already, last summer, when Salon published a ridiculous piece “debunking” the “myth” that canning will save you money, but I guess if they’re going to write the same article over and over, I’ll have to keep throwing in my two cents. Canning is useful if you have an excess of something. It’s a method of preservation. If you want to make a hobby…