When I ran a playgroup for 2-5 year olds, we kept a heap of the big polystyrene pieces that are packed around white goods. The children would build houses with them, complete with windows. If the houses fell down, or someone used a piece as a weapon, no-one got hurt. Soon after this, toy-shops began to stock cubes and other shapes of foam covered with PVC, at extortionate prices, but our polystyrene was free!
Does Israel want full scale war in the Middle East?