As night fell across northern Thailand, a 1-foot-long creature emerged from its hiding place and climbed along the rocks. Its “golden yellow” eyes scanned the surrounding forest, but it wasn’t the ...

While viral pink eye may cause your eyes to water, bacterial pink eye is often accompanied by green or yellow discharge. Viral pink eye also often begins with a cold, whereas bacterial pink eye is ...

Green light is in the middle. Our eyes only detect three colours ... By mixing red light and green light, for example, we can see yellow. If all three are mixed together we see white light.