One of the impediments to developing miniaturized, “squishy” robots is the need for an internal power source that overcomes the power-to-weight ratio for efficient movement. An international group has built upon their previous research and identified new materials that directly convert ultraviolet light into motion without the need for electronics or other traditional methods.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2016/11/161110124109.htm
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