Photo: Tim Morris From Wired Science:
Caffeine
This is why the world produces more than 16 billion pounds of coffee beans per year. It's actually an alkaloid plant toxin (like nicotine and cocaine), a bug killer that stimulates us by blocking neuroreceptors for the sleep chemical adenosine. The result: you, awake.
Water
Hot H2O is a super solvent, leaching flavors and oils out of the coffee bean. A good cup of joe is 98.75 percent water and 1.25 percent soluble plant matter. Caffeine is a diuretic, so coffee newbies pee out the water quickly; java junkies build up resistance.
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