Greetings. Well I do not have enough time to pose all of my questions and ideas I can get this thread started off. So lets get right into it. The teeth of a Beaver incorporate a comparatively high percentage of iron in their construction, making them very strong and orange hued. (Also made to be self sharpening.) Using the same principle, could one modify a human to have a harder, stronger skeleton able to withstand more punishment and or teeth by causing the body to naturally incorporate higher amounts of things like iron, or 'naturally occurring carbon fibers':D? Advantages are obvious, like being able to use more of our potential strength without breaking our own bones, but what could be the potential downsides, like setting off metal detectors? How strong can a human skeleton and human teeth get?