9. WATER JET PRINTER

♤ It is newly invented computer printer which uses water instead of ink to print.

♤ It uses paper coated with special dyes and the used paper fades back to white within a day, enabling it to be reused.Technology allows each page to be reprinted dozens of times —based on 50 times of rewriting, the cost is only about one percent of the inkjet prints. A money and tree-saving option in a digital world that still relies heavily on hard copy.