Once upon a time there were three little boys left unsupervised while on a field trip when one of them spotted a large crack in a window pane. So he tapped the glass once and nothing happened. Next, the second boy tried his luck and poked the glass as well. Tap tap tap. Again it did not break. Now the third boy approached, looked around, saw that none of the teachers were watching and because his friends didn’t break the window he tapped lightly on the glass with his index finger. Nothing. So he poked harder. No change. Then…







