"Why are there so many songs about rainbows?" sings Kermit the Frog in a song (about rainbows) called "Rainbow Connection" from 1979's "The Muppet Movie." And it's not just songs that feature rainbows ...

As the U.S. continues to wait for newer sunscreen ingredients, patients should use tinted sunscreens to protect against visible light that causes photodamage, melasma and hyperpigmentation, according ...

Radiation within the visible spectrum can appear black if it is low in power – more specifically, lower in power than its ...

Tunable lasing at around 405 nm is realised with an InGaN device featuring a narrow-ridge active channel and a periodically ...

Mantis shrimp have remarkable colour vision. They have as many as 16 types of photoreceptor cone, compared with the three ...