“Although it is one of the best-studied compounds in the world, we still have much more to learn about caffeine, including the reasons it affects people so differently – making some people anxious and jittery, and others so happy and energetic that they feel as though they can’t function without it.” Reveal’s Ariane Wu and Murray Carpenter take an interesting (and surprising) look at the world of caffeine — including the 17 million pounds of it we import each year (I assume you know I couldn’t possibly open all these browser tabs without being juiced…). The buzz(kill) about caffeine.