No one knows who invented pencils or when it happened. A Swiss described a pencil in a book in 1565. He said it was a piece of wood with lead inside it. (Lead is a very heavy, soft, dark gray metal. ) Pencils weren't popular, and people continued to write with pens. They used bird feathers as pens.

Then, in 1795, someone started making pencils from graphite (石墨), and they became very popular. One pencil can write 50,000 English words or make a line 55 kilometers long. 

People wrote with feather pens and then used pens with metal points. They had to dip (蘸) the point into ink after every few letters. Next, someone invented a fountain pen that could hold ink inside it. A fountain pen can write several pages before you have to fill it again. 

Two Hungarian brothers, Ladislao and Georg Biro, invented the ballpoint pen. English pilots liked the pens. They couldn't write with fountain pens in airplanes because the ink leaked out. Later, a French company called Bic bought the Biros' company.

Some people call ballpoint pens "Bics. " Australians call them "Biros. " Whatever we call them, we use them every day.