Multitasking makes us stupid and, oops, I've got to take this call...

"... certain studies find that multitasking boosts the level of stress-related hormones such as cortisol and adrenaline and wears down our systems through biochemical friction, prematurely aging us. In the short term, the confusion, fatigue, and chaos merely hamper our ability to focus and analyze, but in the long term, they may cause it to atrophy." From The Atlantic: The Autumn of the Multitaskers

via /.