What Would Happen If.....

What if? by Randall MunroeThe question crosses your mind when you look up into the night sky... "I wonder what would happen if the moon went away."  The next day at the gym... "What if all these people on exercise bikes were hooked up to turbines to produce energy.  Would it be enough to run my coffeepot?"  Oh come on - you haven't thought these things before??  For those of you who have, check out Randall Munroe's What If?: Serious Scientific Answers to Absurd Hypothetical Questions.