Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Thomas J. Brock is a CFA and CPA with more ...

Air filters are used to filter the air for removing unwanted materials such as dust and pollutants and to cleanse the air by removing vapor or gas. Air filters are ...

Optical sensors are a broad class of device for detecting light intensity. This can be just a simple component for notifying when ambient light levels rise above or fall below a prescribed level, or a ...

Jan. 5, 2026 CO2 can stimulate plant growth, but only when enough nitrogen is available—and that key ingredient has been seriously miscalculated. A new study finds that natural nitrogen fixation has ...

Jacob Soboroff was raised in the Pacific Palisades and reported live from the area as it was devastated by fire in 2025. In Firestorm, Soboroff offers a minute-by-minute account of the catastrophe.