Tech Xplore on MSN

Low-cost sensor system can check indoor air quality in real time

Humans spend about 80% of their time indoors, but keeping track of the air we breathe usually requires expensive lab-grade ...

I tested the best $20 security camera you can buy (and it works outdoors)

The Blink Mini 2 is a feature-rich security camera that costs $20. An extra $10 gets you a waterproof adapter, making the deal even sweeter.