<p>➀ Scientists developed a magnetic metamaterial that can reprogram its stiffness and shape without altering its composition, using embedded magnets in a rotating rhomboid matrix; </p><p>➁ The material's properties are controlled by adjusting magnet distribution or external magnetic fields, enabling applications in robotics, biomedicine, and adaptive impact protection; </p><p>➂ Potential uses include smart sports gear, vascular medical devices, and reconfigurable aerospace components.</p>