These shape-shifting devices melt and re-form thanks to magnetic fields
Gallium plus magnetism equals something straight out of Terminator 2
This Lego-like figurine escaped from prison Terminator 2–style thanks to a new composite of gallium and magnetic particles, which liquefies in the presence of a changing magnetic field and moves under the guidance of a permanent magnet.
Q. Wang et al/Matter 2023 (CC BY-SA)