bones to blood vessels -- and now you can add antique violins to that list. Music loving Radiologist Steven Sirr popped his into a CAT scanner to see what it was made of, then showed the results to a violin-making friend. Curiosity soon led them to scan everything from guitars to mandolins, so when the chance to take a peek inside a 307-year-old Stradivarius came up, how could they resist? 1000 scans later, the files were converted to 3D CAD format and another violin maker enlisted. Crucially, the images show the density of the wood all the way through, allowing a CNC machine to carve out copies of each section, with different woods used to match the differing densities. With all the parts in place and a lick of varnish, the replicas were complete. Sirr claims the copies sound "amazingly similar" to the original, but we are unsure if he plans to make it open-source.