One of the easiest and most useful smart home upgrades you can make is picking up a couple of smart light bulbs. Here’s how to get started.

Editor’s Note: Call to Earth is a CNN editorial series committed to reporting on the environmental challenges facing our planet, together with the solutions. Rolex’s Perpetual Planet Initiative has ...

Can you benefit from light therapy? It depends. Treatments range from nonsensical to possibly useful to those proven to be effective. Without light, there is no life. Literally, it was Dutch scientist ...

Does light behave more like a particle, or like a wave? Today we know the surprising answer. Here's why it took so long to get there. When you purchase through links on our site, we may earn an ...