Live heart cells make this material shift color like a chameleon

The hydrogel-based strips change hues when contracting and expanding

chameleon material

KEEPING THE BEAT  Five hydrogel strips covered in heart tissue contract when the heart cells do. That shrinkage makes the material reflect more blue light. When the cells relax, the strips extend and reflect more red light.

F. Fu et al/Science Robotics 2018

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