I often hear folks joke, "Yeah, I had a garden once. I put in all this money & effort, and I only got a handful of tomatoes. Each one of them cost $27!" And they usually end by saying something about not having a green thumb. My first tomatoes of the season I smile and think about a mental model I've been working on: Growing your groceries is like washing your dishes. While they're raving about how many plants they've killed, I'm thinking, "It's not your thumbs. I bet you don't have a sink. And if you do, are you using decent soap or that garbage from the dollar store? And did you mention you've never washed dishes before in your life? And you're surprised you broke a couple wine glasses with no more experience than a four-year-old?" My eyebrows furrow involuntarily belying my thoughts, "Really? That doesn't seem all that surprising to me." But, of course, not only would saying all that confuse people, it...