Science and Technology Daily: Amazing super materials can retract or expand on their own without external force.

Physicists from Leiden University in the Netherlands published a research report in the journal "Nature" on the 25th, stating that they have created a miraculous metamaterial that can autonomously shrink and expand without the need for any external force, just like breathing on its own. This achievement opens up a new path for intelligent reconfigurable materials and micro-robot technology.