Find the miracle / Environmental protection

It can be observed that disposable pen is widely used. Personally, the value of this type of pen is much less than that of its manufacturing. In many cases, though the ink has not been used up, it is discarded. Or because of improper use, ink has dried, causing a huge waste.
It can be found that actually there are many " pens " around us, as long as attention is given, and with some processing, we can get a very cheap, environmentally friendly and unique pen.