"Multitasking means screwing up several things at once," somebody once said, wrongly. In fact, we don't do many things at once, ever. We do many things in quick succession. And some of us are very ...

In a world that rewards speed, slowing down and focusing on one task at a time may be the real cognitive advantage.

If you have attention-deficit/hyperactivity disorder (ADHD), you probably know the feeling of trying to do too many things at once. You start an email, then remember ...