Here's an amazing Off Topic bit of tech news to brighten your day. Doctors working directly with scientists have developed a working "Biopen" which can 3D Print cartilage and other tissue on the fly during surgery. The device uses hydrogel and your own stem cells for its "ink." The device can be used in various forms of surgery where custom tissue generation is required. During a procedure, the "Biopen" allows surgeons to precisely customize the joint to the patient. It uses surgical "scaffolds," and permanently hardens the biogel using ultraviolet light. The "Biopen" is still in testing, and there is no word on when it will be used for human trials; however, the current testing results are promising, so it likely won't take too long before we see this come to hospitals and clinics. Be sure to check out the video demo in the thread below.