Rumination or time travel? The dark network in the brain

A book on becoming a more efficient thinker decried all the time we spend ruminating, mulling over past times and imagining future possibilities. It was, from the author’s point of view, a sheer waste of brain-power. Now, Daniel Gilbert weighs in with another perspective: all that mental time-travel is a way of learning. You’ll have to skip down a little to find the Dark Network article.