When my wife and I moved into our first house, my biggest concern was not that it needed paint, or that the driveway was rutting out, or that the carport was infested with spiders — though all of that was true. No, my biggest concern was the yard. It’s a fairly small yard, only about a quarter-acre; most of the lot is wooded. But however small the yard, however shady and littered with rocks and stumps, I was still going to have to buy a lawn mower. And I really, really didn’t want to buy a lawn mower.