Understanding some fundamental human tendencies can help you boost productivity throughout the day, Ilya Pozin writes. For instance, multitasking causes your IQ to drop 15 points if you're a male and 5 if you're a woman -- so don't do it, Pozin writes. Also, after 60 to 90 minutes of working, your brain runs out of glucose and stops functioning at a high level, after which you'll need a break to recharge, Pozin writes.

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