Adding a smattering of bacteria can help a laser beam travel further through murky water. The finding could help people perform non-invasive medical diagnostics or image deep tissue without causing any damage. Particles in a liquid normally cause light to scatter--that's why people's car headlights don't penetrate far in dense fog. But when Zhiqang Chen at San Francisco State University and colleagues shone a high-intensity green laser through seawater containing a cyanobacteria called Synechococcus, they found the light traveled further than they expected.
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