Pulsating gels could power tiny robots

As a kid, did you ever put those little capsules into warm water and watch them grow into dinosaurs? When certain gels are put into a solution, they will not only expand, but also contract again, repeatedly, as if the little dinosaur grew and shrank over and over.

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<p><a href="http://www.physorg.com/news81707579.html">Pulsating gels could power tiny robots</a></p> <p>As a kid, did you ever put those little capsules into warm water and watch them grow into dinosaurs? When certain gels are put into a solution, they will not only expand, but also contract again, repeatedly, as if the little dinosaur grew and shrank over and over.</p>