Apple has given my son a hand! – the surprised pessimist
One of the accessibility features built into OS X:
Using Switch Control, and tapping a small switch with his head, my son tweets, texts, types emails, makes FaceTime calls, operates the TV, studies at university online, runs a video-editing business using Final Cut Pro on his Mac, plays games, listens to music, turns on lights and air-conditioners in the house and even pilots a drone!