“the brain is limited, lacks bottomless capacity, and isn’t particularly fast relative to computer technology. The technological advances defined by laws of Moore and Metcalfe got married and long since overtook what our brains can handle. And we know now that their union also presents the challenge of addiction, or, at least, serious compulsion. Even allowing for the fact that we can know these devices challenge our limitations, sometimes they are so compelling we can’t stop using them.”