The theory of relativity works well when you want to explain cosmic-scale phenomena -- such as the gravitational waves created when black holes collide. Quantum theory works well when describing particle-scale phenomena -- such as the behavior of individual electrons in an atom.

Apple released the second beta version of iOS 16.5 less than a week after it pushed out an important security update with iOS 16.4.1 on April 7. Both iOS 16.5 beta versions brought smaller, more incremental changes to beta testers' iPhones.

Your iPhone is way more powerful than you think. Underneath all the major new features on iOS 16, like home screen widgets, Live Activities and Emergency SOS via satellite, there are impressive features and settings that Apple may not give as much shine to, but that you should definitely know about.

The world's tallest woman could fly on a plane for the first time after the airline removed six economy seats to accommodate her. Rumeysa Gelgi, who stands at 7 feet, 0.7 inches tall, was named the world's tallest woman by Guinness World Records last year.

From locks to lights to thermostats, here's a growing ecosystem of "smart" devices for your home. And one of the easiest ways to control them is with an Amazon device.