Just when you thought material science didn't get any wilder, we now have this New Scientist article detailing the latest development in bone reconstruction... printing bone grafts. According to the story, a company has developed a new polymer-based material that's porous enough to promote bone growth while still being strong enough to bear weight. They use a rapid prototyping machine to create computer-designed graphs which can then be implanted into an injured patient. The implications for accident recovery alone are huge.