Scooter sharing companies have tried numerous ways of promoting helmet use, but Bird is trying a particularly direct method -- good, old-fashioned rewards. The service has introduced a "Helmet Selfie" feature that offers perks in return for snapping a photo of yourself wearing a helmet at the end of your trip. Computer vision automatically detects the helmet to keep riders honest. The full range of rewards isn't available, but ride credits are part of them. You may get to ride more often simply by protecting your cranium, then.