Infinite Sets. If you continue to study this subject you will find discussions about infinite sets, and the idea of different sizes of infinity. That subject has special names like Aleph-null (how many Natural Numbers), Aleph-one and so on, which are used to measure the sizes of sets.
For decades, glossy paper, the type used in magazines, was made using a white clay called kaolin (named after the Chinese region Kao-Ling where it was mined to produce porcelain).
The hardboiled detective and science fiction genres were created by the freedom that the pulp fiction magazines provided. Pulp Fiction is a term used to describe a huge amount of creative writing available to the American public in the early nineteen-hundreds. Termed pulp magazines because of the low quality paper used between the covers, these publications proliferated in the nineteen-thirties and nineteen-forties to the point where they blanketed newsstands in just about every popular fiction genre of the time.