That little square you scan at restaurants, stores and airports looks like random black-and-white noise. It isn't. A QR code stores information in a pattern that cameras can read extremely quickly. And because it includes error correction, it can still work even when part of the code is damaged or covered. That's why you can sometimes scan a QR code that looks absolutely terrible.
It’s not always because your phone is “old.” Storage getting crowded, background processes, software updates, battery condition and apps getting more demanding can all play a part. That expensive phone you bought three years ago hasn't suddenly forgotten how to work. The digital world around it has simply gotten heavier.
You open five Chrome tabs, start a video call, run Photoshop and wonder why your laptop sounds like it's preparing for takeoff. The fan isn't randomly going crazy. Your computer is producing more heat because the processor is working harder, and the cooling system is trying to move that heat away. Basically, your laptop is sweating — just with a fan.
