hard 퀴즈

The supervisor was very cruel to Josh, as he would always give Josh the hardest, most degrading work he could find.

Graphene is the strongest, thinnest material known to exist. A form of carbon, it can conduct electricity and heat better than anything else. And get ready for this: It is not only the hardest material in the world but also one of the most pliable. Only a single atom thick, it has been called the wonder material. Graphene could change the electronics industry, ushering in flexible devices, supercharged quantum computers, electronic clothing and computers that can interface with the cells in your body.