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Nature 458, 542 (26 March 2009) | doi:10.1038/458542a; Published online 25 March 2009

Open Innovation Challenges

String-driven thing

Vaughan Stanger1

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A knotty problem.

When it comes to generating energy, Robert Heinlein's maxim definitely applies: "There ain't no such thing as a free lunch." For now, the Sun continues to shine.