Deep in a sunny garage workshop, a whole batch of little homemade robots has just been switched on for its first test. There is only one problem: their wheels work, but their steering does not, so they simply follow whatever moves in front of them. Pixel Mark Rober grins, takes the lead and turns the test into a parade. The notebook on the workbench gets a new heading: Sprocket Squad.
Loose hex nuts lie scattered all over the plywood floor, and every one he picks up wakes another robot that rolls in at the back of the line, which grows longer and a little faster with every nut. Pegboard walls and workbenches ring the floor, so one wrong turn ends the test, and so does bumping into the robots behind him. Now and then a curious squirrel dashes in from the backyard, worth a big bonus if he reaches it in time. How long can the squad get?
