I've been to both the Blue Lagoon and the Sky Lagoon in Iceland, but there's only one I'd go back to again and again.

We’re all taught that water is clear, so why does the ocean look so strikingly blue when we’re staring out at it? It turns ...

The lightning strike occurred approximately four miles from the storm, illustrating the danger of blue-sky lightning, which can travel up to 20 miles from its parent thunderstorm.

"The blue wavelengths of light are scattered, similar to the scattering of blue light in the sky, but absorption is a much larger factor than scattering for the clear ocean water.

Learn why the sky is blue through the lens of physics and chemistry. Discover the science behind Rayleigh scattering, light wavelengths, and atmospheric composition in this detailed explainer.