PCWorld explains how to create an affordable CO2 air quality monitor using a Raspberry Pi and MH-Z19C sensor for under $40. This DIY project helps monitor indoor air quality since high CO2 levels ...

A reliable indicator of the air quality in offices, classrooms, or living rooms is the CO2 content. In fresh air, the concentration of carbon dioxide is around 400 ppm. This stands for “parts per ...

Robotics is a fascinating field that has come a long way in recent years. What was once cutting-edge and prohibitively expensive for consumer-grade projects has rapidly become accessible to the hobby ...

Leveling up in Borderlands 4 is essential to success. You won't have much hope of completing the story at level one, of course! Thankfully, you don't have to worry about that. Gaining XP and leveling ...

The hardest part of working out consistently? Getting started. Once you do, though, you start feeling (and soon, seeing!) the positive impact on your mind and body. But with so many workout options ...

Jan. 9, 2026 Scientists in South Korea have discovered a way to make all-solid-state batteries safer and more powerful using inexpensive materials. Instead of adding costly metals, they redesigned the ...

I've been testing PC and mobile software for more than 20 years, focusing on photo and video editing, operating systems, and web browsers. Prior to my current role, I covered software and apps for ...

Jae Bratton has been writing about credit cards for NerdWallet since 2022. Her work has been published in The Washington Post, the Los Angeles Times, The Associated Press and the journal Studies in ...