An article from the New York Times reports that electronic multitasking is making us dumber. By filling every idle moment with mental input and sensory stimuli of all kinds, we're reducing our brains' downtime. (I recently wrote about a similar article extolling the virtues of daydreaming.) It is becoming apparent that we need the occasional zoning-out zone to absorb information and lay down long-term memories. Nature walks, apparently, are much better for you than a stroll down a city street.