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As we drove past the barricade that kept most people out of the tragedy zone , I was astounded by what I saw : here it was , midnight on a Friday , and yet dozens of people were standing there , holding candles and flags , and cheering when police , firefighters and rescue workers drove by . It was industry that first adopted foam where its qualities allowed ever cheaper products , cheaper because they were lighter , so less raw material was needed , and easy to produce . This routine orders those columns by walking up the parent tree ( a column is a child of the column which absorbed it ) . " One critical issue , he said , is increasing audience attendance at arts events , a goal which he says can best be achieved through arts education at all levels . Himsworth made the sensible recommendation that in future , riot agents should be regarded more akin to drugs than weapons and the authorities should publish the results of safety tests , in the scientific press , in full , prior to any authorization .