We all have things in our lives that we wish could change. Maybe you don’t have the job or relationship you want. You lost a loved one, or you’re having health problems. Or maybe you’re in a bad ...

Sitting outside a Catholic church on the French Riviera, Carlo Rovelli jutted his head forward and backward, imitating a pigeon trotting by. Pigeons bob their heads, he told me, not only to stabilize ...