This is the best lesson to kick off the year in science and usually draws a little science student crowd hounding you for more answers to their questions but the best part is that it is a quick & cheap demonstration while reviewing the scientific method process as a class. I give teacher instructions on how to make a mystery substance that will cause a dollar bill to burn but stop burning without damaging the dollar bill itself as well as many other teaching tips. Believe me, this is worth more than a dollar because of the awe and sparkle in student's eyes as well as pure fun! Enjoy!