1. What's the difference between "uncaffeinated" and "decaffeinated"?
2. We all grapple with nerves when we face some test of our abilities. To find out how the impulse to banish the butterflies works out, Allison Wood Brooks of the Harvard Business School turned to karaoke. She asked subjects to state that they felt either anxious, excited or calm before launching into song, regardless of how they actually felt. The result: the people who said they were excited received the highest marks for their musical prowess on the karaoke console.
What does "To find out how the impulse to banish the butterflies works out" mean?