I think whether multitasking is a good thing or not depends on the context. I agree that driving while doing pretty much anything else is a bad idea, and it's hard to carry on a conversation on the phone while I'm also reading email or something. But I find talking on the phone while I'm doing something relatively mindless - cleaning, walking the dog, whatever, perfectly harmless. And what else are you going to do on the subway - stare at the wall? Doing work on the train or a plane seems like a good use of time. I think there's something to be said for being fully present to what you're doing, but there's also something to be said for killing two birds with one stone. I also disagree that the science he quotes necessarily means that all multitasking is inefficient, espcecially when one of the tasks is relatively mindless.
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"If ten million people believe a foolish thing, it is still a foolish thing."
- Anatole France
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