If you live in a big city, you’ve almost certainly seen them around. They dart in and out of traffic, fly past you on the sidewalks, and careen forward with acrobatic abandon. No, not pigeons. The daring gymnasts in question here are e-scooters. They’re everywhere. As their number increases on our streets, they are bound to upset the occasional fire hydrant, as well as pedestrians, sometimes resulting in personal injury on e-scooters and with e-scooters.