| 1 | Tononi said. In effect, the network becomes one giant photodiode. | |
| 2 | This disease is caused by hardening of arteries in the macula, the light-sensitive tissue in the center of the retina. | |
| 3 | Researchers add genes for light-sensitive proteins to certain cells in the organism. | |
| 4 | Melanin, a pigment that gives hair its colour, is light sensitive and also acts as a type of conductor. | |
| 5 | But a powerful laser could probably burn sensitive optical sensors on a satellite, doing permanent damage. |