Watch a Möbius strip robot move and climb when hit by light

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Zi Liang Wu at Zhejiang University in China and his colleagues created their strips from thin sheets of hydrogels, materials made from long chain-like polymer molecules linked together by water molecules. They made the strips into unusual shapes, such as a Möbius strip – a one-sided surface that results from a band with a twist in it – or a similar curved surface called a Seifert ribbon. A soft robot shaped like a Möbius strip can move when activated by light, and could be used to transport medicine and collect samples inside the body.

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