Your brain allows you to multitask. You can prepare dinner while talking on the telephone and also scribbling out a grocery list. This multitasking has limits, of course—you can probably do only two or three things simultaneously (at least if you want to do them all well). But suppose you could put down the work, start another piece of work, then put that down, and then switch to the original work. How many tasks could you handle at the same time? Probably a few hundred, because what you are doing is serializing the multitasking.
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