Birds-of-paradise are even colorful in the dark, with feathers and body parts that glow a brilliant yellow-green under ...

One quick fix is to use blue light filtering glasses, but researchers at the University of Houston have been working on a much neater solution: a new violet LED chip that uses much less blue light.

It might seem like a simple question. But the science behind a blue sky isn't that easy. For starters, it involves something called the Rayleigh effect, or Rayleigh scattering. But that same ...