Question

9 stones are in front of you and you are allowed to keep one. the stones are identical in appearance and 8 of them have the same weight. 1 of the stones has powers. that stone weights a little bit more than the others, but you can't tell the difference if you were holding it. you have a balance scale, but you can only use it two times. describe step by step the process for determining which stone is the one that weighs a bit more than the others.