Lara Rhame
Lara Rhame
ball bouncing driveway easiest event fairly garage onto roof slope sure unclear
Probably the easiest way to think about the Sept. 11 event is to think of bouncing a ball off the roof of a garage onto the driveway, ... The ball's bouncing around, and it's still unclear what the slope of the driveway is. But we can be fairly sure it's sloping up.