With the development of high-definition television, and the popularization of broadband and digital storage of movies, a further format development took place, again giving rise to two camps : HD DVD and Blu-ray Disc, based upon a switch from red to blue-violet laser and tighter engineering tolerances.
22.
As someone here pointed out a while ago, the earth is closer to being a perfect sphere than is a standard competition billiard ball . ( And it's true-I checked-the acceptable engineering tolerances accepted by the rules of billiards allows a ball that is less spherical than the earth to be used in competition ).
