The technique begins with the placing of light-sensitive proteins from green algae inside specific types of brain cells.

FORBES: Ideas & Opinions

D. from Stanford and made his breakthrough almost immediately after starting his own lab in 2004, taking advantage of a 2002 discovery of light-sensitive proteins in green algae called channelrhodopsins.

FORBES: Magazine Article

It is an interesting triple "coincidence, " which probably evolved over time, that our eyes are most sensitive to yellow-green light, which happens to be the characteristic color of sunlight as well as the color that can most easily be transmitted through the Earth's atmosphere.

CNN: Why gamma-ray burst shocked scientists

She added that powers would not be limited to national security matters - the green paper says the procedure could be triggered by the secretary of state deciding "that certain relevant sensitive material would cause damage to the public interest if openly disclosed".

BBC: UK Politics