In mathematics, a developable surface (or torse: archaic) is a surface with zero Gaussian curvature. That is, it is a surface that can be flattened onto a plane without distortion (i.e. "stretching" or "compressing"). Conversely, it is a surface which can be made by transforming a plane (i.e. "folding", "bending", "rolling", "cutting" and/or "gluing"). In three dimensions all developable surfaces are ruled surfaces (but not vice versa). There are developable surfaces in R4 which are not ruled. == Particulars == The developable surfaces which can be realized in three-dimensional space incl...

Black Mirror is a British science fiction television anthology series created by Charlie Brooker and centred around dark and satirical themes that examine modern society, particularly with regard to the unanticipated consequences of new technologies. Episodes are standalone works, usually set in an alternative present or the near future. The show was first broadcast on the British Channel 4, in 2011. In September 2015, Netflix commissioned a third season of 12 episodes. The commissioned episodes were later divided into two seasons of six episodes; the third season was released on Netflix worldwide...