Caffeine 101 | National Geographic

Nearly 90% of the United States population has at least one caffeinated beverage every day. Learn about the chemistry of caffeine, how it causes increased alertness and focus, and how caffeine is capable of causing overdoses.
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Read more in "Do you love or loathe coffee? Your genes may be to blame."
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Caffeine 101 | National Geographic
   • Caffeine 101 | National Geographic  

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