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Researchers at Nagoya University have built a graphene nanoribbon that can switch which way it twists using a natural solvent. Graphene nanoribbons are thin ribbon-shaped structures made of fused carbon rings. Twisted or helical versions of these ribbons show promise for advanced light and electronic devices. However, no graphene nanoribbon could switch that twist on demand, until now. Scientists have worked out how to switch between a right-handed and left-handed twist (chirality) by changing the solvent around it. The discovery, published in Nature Communications, opens opportunities for new optical switches, chemical sensors, and spintronic components that adapt to changing environments.