Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest light might ...

I'm a certified sleep science coach who has tested over 50 mattresses. Cold winter months can affect our mental and physical health in myriad ways, given the season’s long nights and limited daytime ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Rory Evans Rory Evans is a writer focused on skin-care and beauty products.

In every home I've had in the past decade, I've installed smart light bulbs. Over and over again, between four different apartments and one townhouse, I was impressed by how easy smart lights were to ...

Stocks: Real-time U.S. stock quotes reflect trades reported through Nasdaq only; comprehensive quotes and volume reflect trading in all markets and are delayed at least 15 minutes. International stock ...

Jason Chun is a CNET writer covering a range of topics in tech, home, wellness, finance and streaming services. He is passionate about language and technology, and has been an avid writer/reader of ...

LED bulbs often don't last as long as they should. We talked to the experts to figure out how to extend their lifespan. Tyler Lacoma Editor / Home Security and Smart Home Tyler has worked on, lived ...