I use Andy..for questions like....."Is it going to rain..?". Andy is a plain rubber (or eraser. However you call it in America) that is in a rectangular shape. It has Yes and No. On both sides. So I drop Andy, Andy either lands saying Yes or No. And Andy is always right. (Mind you, I keep it safe more than anything.) So, if you want a Yes or No answer. Ask me and I'll ask Andy..The rubber.. for you.