Can You Walk The Plank?
Imagine a thick, strong plank of wood – 30cm wide and 10m long. Can you walk along that plank without falling off? If it’s lying on the floor – sure. That’s pretty easy. A dozen steps is all it takes. All of us could manage that. What if we suspend the plank between two chairs, so it’s 50cm off the ground? Ok, that’s a little trickier … some of us would manage, some might not