Copy Machines -- Duplex Printing

QUESTION/SUGGESTION: Why doesn't the copy machine make copies on both sides (duplex printing) of the paper. It would save a lot of paper and space.
ANSWER: I have just learned that the library will receive new copiers in just a few weeks. At this time, we are not sure if they will allow duplex printing. Please note that public printers in the library will offer duplex printing soon.