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 ...

Ever wonder why the sky is blue, vs. say red, orange or purple? An effect called Rayleigh Scattering is part of the reason we see only blue, despite it all starting with a rainbow of colors.

A quarter of a century later, precisely and recently, the boy and the father returned to Yosemite Falls to try and relive ...

Get up to speed on gamma rays, the radiation responsible for creating the Red Hulk in Captain America: Brave New World.