Welcome to Fermi Questions; the blog that asks you to think outside the box. Every Friday there will be a new order-of-magnitude estimation to ponder, as well as the answer to last week's question. Please check out this post to learn how to solve the questions. When solving, please use a pencil and paper only. After you make an estimation, you may use a calculator and internet research to check your answer. I will explain how I got my answer, but if you think I did something wrong please speak up! If you have questions, comments, suggestions, or ideas for new Fermi Questions, please comment.