At its core, the AR-15 uses a direct impingement gas system to cycle rounds. This system redirects a portion of the gas ...

Discover how the European Monetary System (EMS) stabilized currencies and laid the groundwork for the euro, creating economic unity in Europe from 1979 onwards.

Explore the U.S. bicameral legislature, its structure with the House of Representatives and Senate, and the historical ...

Your furnace's job is keeping you warm. Get to know the parts of a furnace so it will do that job better and last a lot longer.

Baja California Governor Marina del Pilar Avila Olmeda has thrown her full support behind Mexico's recently approved National ...

UC Riverside scientists have created a small-scale system that transforms food waste into high-protein animal feed and ...

Before Rahmanullah Lakanwal settled in a quiet part of Washington state, he was part of a secret unit of Afghans who operated under CIA direction and hunted down Taliban commanders in highly dangerous ...

The units were backed by the C.I.A. and trained to conduct missions in Afghanistan during the U.S. war in the country. By Jonathan Wolfe Elian Peltier Thomas Gibbons-Neff and Fahim Abed The man ...

Ahmad Mukhtar is a producer for CBS News based in Toronto, Canada. He covers politics, conflict and terrorism, with a focus on news from Canada and his home nation of Afghanistan, which he left ...

When killer T cells of our immune system divide, they normally undergo asymmetric cell division (ACD): Each daughter cell ...

The Duffer Brothers discuss the biggest moments from season five's first four episodes. By Josh Wigler Contributor Within the first four episodes of their final season, Stranger Things creators Matt ...

What makes someone a "morning lark" or a "night owl?" Why does jet lag hit us so hard, and why do some people struggle each ...