Millions of people donate blood each year, saving countless lives. After a donation, plasma and white blood cells are ...

Discover how the Modified Dietz Method measures investment returns, factoring in cash flow timing and excluding skewing ...

National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...

Residual current circuit breakers (RCCB) play a narrow but important role in electrical protection. They are frequently specified, often misunderstood, and regularly credited with capabilities they ...