Stop Multitasking. No, Really — Just Stop It.

Ugh:

We’ve also long known that multitasking doesn’t really work. You’ve probably read — perhaps while half-watching TV — articles explaining the research findings that multitasking isn’t really even possible; mainly, we’re just switching our attention rapidly between different foci without realizing it, incurring cognitive costs each time we do so. One study of drivers found only 2.5 percent of people showed no performance decrease when attempting two tasks at once. The rest of us just end up doing everything worse.