Wired reports Harvard researchers have managed to create "living lasers" out of human embryonic kidney cells re-engineered to create a protein used by jellyfish to create light:
When the team ran pulses of blue light through the kidney/jellyfish combo, a visible laser beam shot out. It only lasted for a few nanoseconds, but the light could be easily detected and carried useful information on the properties of the cell. The cell also left the experiment unharmed.
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