"If you are looking for a bracing alternative vision of physics built from the ground up, Smolin's Time Reborn will take you to the mountaintop." -- NPR

What is time?

It's the sort of question we rarely ask because it seems so obvious. And yet, to a physicist, time is simply a human construct and an illusion. If you could somehow get outside the universe and observe it from there, you would see that every moment has always existed and always will. Lee Smolin disagrees, and in Time Reborn he lays out the case why.

Developments in physics and...