When our son was 4 years old, he asked my wife and me: "Can you drive to heaven?" Out of the mouth of babes, right? It’s a question only a child would ask, but it raises a very adult question: Where ...

While humans have been obsessed with going to heaven, a former Harvard professor has asked and answered one of the most vital questions: Where is it? For years, the existence of 'heaven' has been a ...