In the days of yore, if you were a city official and wanted to fix a pothole, you’d just send out a road crew to do it. A typical squad of four men could repair five of them in the course of an average day, including breaks for lunch, coffee, and scratching their butts. Now things have changed. There is a futuristic new machine called the pothole killer that allows one person–who never has to get out of the truck cab–to “hot patch” 100 potholes in a day. (Watch the video for details.) In other words, the machine makes human...