^^ 안녕하세요. The first problem was sloved when steel came into wide use in the late 1800s. A set of steel girders fastened together supported the structure. Because the outside walls no longer carried the weight of the building, they could be made of glass or some other light material. There was no limit to how tall buildings could be, except for all those stairs! Teasing becomes bullying when it is done with malice. The weapons used can be words or fists. Having someone make fun of you can hurt just as much as being hit. Unfortunately, bullying is more common than you might think. A survey of 6,000 students in grades four to six was taken in the late 1990s. A quarter of them said they were often picked on by bullies. One in five admitted to being bullieds themselves.