In a laboratory in Germany, a tiny worm dances to flashes of light. A flash of yellow and it darts forward. A flash of blue and it jerks back. Yellow, forward, blue, back - right on cue every time.rnThe worm is not a toy or a robot but a living creature. It has been engineered so that its nerves and muscles can be controlled with light. With each flash of blue its neurons fire electric pulses, causing the muscles they control to clench. A flash of yellow stops the nerves firing, relaxing the worm's muscles and lengthening its body once again.
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