THE CORRECTION PENCIL

Last week, a group of students from Harvard University developed a new gadget, the Correction Pencil. With this pencil, you can be sure you won't make any mistakes, because it makes a sound when you are writing and you write something wrong, so you can erase the wrong word and write it in the right way, wich is indicated on the screen.

The inventors of the Correction Pencil have decided not to sell it, because a lot of students would use it in their exams to get a better mark, and they think that it wouldn't be fair to the students that haven't got that pencil.