Astronomer Royal Martin Rees: How soon will robots take over the world?

In Davos a few years ago, I met a well-known Indian tycoon. Knowing I had the title Astronomer Royal, he asked: “Do you do the Queen’s horoscopes?” I responded, with a straight face: “If she wanted one, I’m the person she’d ask.” He then seemed eager to hear my predictions. I told him that markets …