Interesting but what's the point? Doesn't seem world changing.,(reply>), A way of crossing water is certainly world-changing, with practically every town and city in the world built along a river. Imagine you work on one side and the doctor is on the other side and there are no boats or bridges anywhere. Seriously mate this is like physics, geography and history at the most basic, basic level,(reply>), Crossing the river simply and cheaply for people and light loads.,(reply>), Dean Hope the point is that it's a simple and elegant solution to a problem. One that could easily have been overlooked. So if most people over looked this, what else has a simple a and elegant solution but is constantly being overlooked.,(reply>), His point wasn't that this particular idea in itself was world changing. His point was that this is a fairly simple idea that seems obvious in hindsight, but is fairly hard to think of without any prior knowledge. There could easily be ideas out there that no one thus far has ever thought of that could revolutionise the way we do something that are in fact quite simple, but have just not been thought of yet.