I tried the washer jumper test that I read on the cancer tutor site. It said a 1" washer with a 1/8 inch hole in the middle and 1/16" thick should jump 14 inches in the air. I didn't have that exact washer. The one I had was bigger, probably 1.5 inches and had a bigger hole, about 1/2 inch. It barely jumped at all, just about an inch or so, but I am thinking that is because of the bigger hole? less contact area? Other than that the thing LOOKS just like the directions describe how one should look. I am just wondering if there is another test with some more common household item or do I need to go buy that exact washer to make sure this thing works right. Ideas?