Recently, researchers announced that 3-D printing ink has a new ingredient: bacteria. The ink is a mixture of a polymer called a hydrogel, bacteria, and a broth of nutrients to sustain the microscopic creatures. This development could revolutionize the cleanup of toxic materials with a process that’s reusable. Though some express concerns with the scalability of the process, the technology is still young. The applications extend to medicine, manufacturing, and any industry that requires precise and flexible material that can self-sustain.