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If you're going to rely on coffee to get you to Friday afternoon, you should know it a little more intimately than "cup 1, cup 2…" and so forth. That's right, we're talking straight chemistry. Ever heard of a little nucleoside called called adenosine? Did we lose you? Come on back, it's just the science of caffeine receptors. Fill up cup 3 and learn exactly why you're watching this video so attentively. 

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