3D printing is getting bigger and bigger. And the range of substances you can use in 3D printing projects is growing, too - including a new project that uses bacteria to make a 3D ink.
With a little help from a Chilean scientist, Leptospirillum ferriphilum can dissolve old iron nails in just a few days, a process that previously took months. That could help deal with the water pollution that comes from metal left over from old mines.
