There are some inventions that look completely pointless to the untrained eye: who would ever need a motorized garbage can, an electric pencil sharpener or a battery-powered eraser? Quite often ...

You can use a highlighter or pen to draw, write something on the screen ... Apart from this, it also provides whiteboard, blackboard, line, arrow, rectangle, and other tools but those are ...

This pen can make your mistakes vanish, just like magic. It is called the HeatVanish Pen and works by using heat sensitive ink that turns clear when hot. The pen is equipped with an electric ...