Virtual reality has taken off in recent years. But what if the virtual worlds of VR are real -- just as real, perhaps, as the physical world we see around us? And... is it possible we're living in a simulation right now? Philosopher David Chalmers probes these questions in his provocative new book, Reality+.

And on the nightstand: A new biography of physicist Freeman Dyson, called Well, Doc, You're In, edited by David Kaiser; and As Gods, by Matthew Cobb.