Scientists create a biological laser beam

Malte Gather and Seok-Hyun Yun from Harvard Medical School and Massachusetts General Hospital have managed to insert a green glowing protein (eGFP) inside a reflective optical cavity of a living cell made from a human embryonic kidney cell line, reports Scientific American. By hitting it with pulses of low energy, the researchers are able to make it glow normally, but when enough energy is applied, the light it emits straightens up, gets brighter, and becomes uniformly green.