His invention was genius. You don’t know his name, probably. However, you must know his invention. This is the ballpoint pen. Maybe you don’t realize the genius side of this invention, but this is the fact. Before the ballpoint pen is invented, people use ink and feather to write. Then, Ladislao José Bíro – the ballpoint pen inventor – think how to write without continously dipping the fur into the ink. It brought him to make a pipe which is filled with ink. Hereafter, the question was how to simultaneously drop the ink whenever we press the pen and move it on the paper to write. Also, the pen must stop dropping ink if we stop our moving. The José Bíro’s idea was genius since he used ball for this purpose. He put ball in the end of the ink pipe, which was move along the pen’s motion. When the ball is moving, then the ink is written on the paper. If the pen is unused, then the ball is stopped, and so does the ink.