Conflicts of interest
None.
Author contributions
The fabrication and characterization of the hair artificial muscles were
carried out by Qian-Ru Xiao. The project was designed and performed by
Si Sun, Xiao-Li Qiang and Xiao-Long Shi. The schematic illustrations for
hair artificial muscles were prepared by Peng Xu. Qian-Ru Xiao and Si
Sun prepared the manuscript. Xiao-Li Qiang and Xiao-Long Shi revised the
manuscript. All authors commented on the manuscript.