Neuroscience explains how the brain keeps (and loses) track of time.

i09 editor-in-chief Annalee Newitz explains how the brain keeps track of time like a clock by sending pulses to your memory. However this internal clock can be sped up or slowed down via a number of factors, including attention and focus, caffeine and other drug intake. Drinking a cup of coffee or focusing on a project increases the number of pulses-per-minute your brain sends your memory, slowing down time-perception and enhancing memory retention. But what seems like five minutes to the brain in a espresso-juiced deadline rush, can actually be more like 25 minutes, explaining why we often miss deadlines. Newitz explains more about why your perception of time will never be exact:

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