Gretel

Hansel and Gretel (German: Hänsel und Gretel) is an opera by nineteenth-century composer Engelbert Humperdinck, who described it as a Märchenoper (fairy-tale opera).

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Mars cave-exploring robots take inspiration from Hansel and Gretel's breadcrumb trick

Robotic Exploration of Caves on Mars and Beyond Inspired by Hansel and Gretel’s Breadcrumb Trick

A trick inspired by Hansel and Gretel could help rovers explore other worlds

Hansel and Gretel's breadcrumb trick inspires robotic exploration of caves on Mars and beyond