According to @ai_darpa, scientists have developed a revolutionary 3D-printable bottlebrush polymer material that closely replicates the mechanical properties of real human tissue, including the ability to stretch up to 1400% without harming surrounding cells (source: @ai_darpa, Jan 2, 2026). This innovation addresses longstanding issues with traditional biomaterials, which were often too stiff or brittle for dynamic biological applications such as heartbeats, lung expansion, and muscle contraction. The new material enables AI-guided bioprinting solutions that can integrate with living tissue, paving the way for scalable, customizable organ and tissue replacement. This leap moves the industry from repairing to reprinting body parts, reducing reliance on donor organs and creating new business opportunities in regenerative medicine and AI-powered healthcare manufacturing.