The hustle we develop as we struggle to keep up with the pace of digital information has produced a restless, anxious way of engaging with the world. Desperate for efficiency, this seeps into our physical lives; I feel compelled to tidy while on the phone, to fold the washing while brushing my teeth. No single task has my undivided attention. A study by the University of California, San Francisco, last week concluded that constant multi-tasking gradually erodes short-term memory. And interruptions are a massive problem, taking anything up to 20 times the length of the interruption to recover. For those of us compelled to check email every few minutes, that revelation explains where the day goes.