The only time multitasking does work efficiently, Meyer says, is when multiple simple tasks operate on entirely separate channels—for example, folding laundry (a visual-manual task) while listening to a stock report (a verbal task). But real-world scenarios that fit those specifications are very rare.
The Benefits of Distraction and Overstimulation — New York Magazine
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Best kind of multitasking in my book = pooping and playing iPhone games