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Does anyone still say "full of beans"? The phrase is supposed to describe someone who's upbeat and energetic. Maybe we can revive the expression by attaching it specifically to coffee beans, as in, "I just had a double-shot cappuccino and boy, oh boy am I full of beans!" 
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In a new study of rat brains published in Nature Neuroscience, researchers report that a single dose of caffeine strengthens brain cell connections and causes a surge in electrical currents in a region of the brain called the "hippocampus."
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The simple tricks to fool Earth-evolved humans into living on Mars time. One Hour Short of Mars Time A new study says exposure to blue light at the right times, along with smarter caffeine use, can help humans adjust our biological clocks to the 24.6 hour Mars day rather than Earth's day.
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Caffeine is regarded by some as being a potent stimulant, but the debate continues as to whether it enhances exercise performance.
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This article is gives a great insite into how caffeine can affect your brain function.