Soap opera Soap opera A soap opera is an ongoing drama serial on television or radio, featuring the lives of many characters and their emotional relationships. The term "soap opera" originated from radio dramas being sponsored by soap manufacturers. BBC Radio's "The Archers", first broadcast in 1950, is the world’s longest-running radio soap opera; the world's longest-running television soap opera is "Coronation Street", first broadcast on ITV in 1960. The first serial considered to be a "soap opera" was "Painted Dreams", which debuted on October 20, 1930 on Chicago radio station WGN. Early radio series such as "Painted Dreams" were broadcast in
Screened Poisson equation Screened Poisson equation In physics, the screened Poisson equation is a partial differential equation, which arises in (for example) the Klein–Gordon equation, electric field screening in plasmas, and nonlocal granular fluidity in granular flow. The equation is where formula_2 is the Laplace operator, "λ" is a constant that expresses the "screening", "f" is an arbitrary function of position (known as the "source function") and "u" is the function to be determined. In the homogeneous case (f=0), the screened Poisson equation is the same as the time-independent Klein–Gordon equation. In the inhomogeneous case, the screened Poisson equation is very similar to