If you’re working with something complicated—for example, writing a report, creating a presentation, developing a piece of software, or crafting a book, you’re holding an incredibly complex object in your mind. You must take into account dozens of factors, remember what you’ve done, where you want to go, and what the impediments might be. That’s a pretty tricky thing to do. And what happens if you’re interrupted or have to switch quickly to another project, even just for a moment? You guessed it: that carefully built mental architecture collapses. It can take hours of work just to get back to
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