A paper clip helps hold pieces of paper together without making a hole. A big paper clip was put up in Norway to help people remember the inventor of the paper clip, Johann Vaaler. He invented the paper clip in 1900 when working in Germany. A paper clip is in fact a piece of wire (金属丝) that is made in such a way that it can hold together many pieces of paper. Now millions of them are made and sold all over the world.

    The ballpoint pen was invented in 1938 by a Hungarian,   had been trying to find another use for the quick drying ink (快干油墨) and designed this pen. Later, a Frenchman, Marcel Bich thought up the idea of making a use-and-throw pen and sold it cheap. It was named BIC and became very popular.