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).
US Paper Sizes. United States of America, Canada and Mexico are the only areas of the world who doesn't respect the ISO paper sizes. Tabloid format is a widely used for printing newspapers that have preferred a smaller size than usual. Indeed, broadsheet format is used by most European newspapers, while tabloid is widely used in Anglo-Saxon countries (Great Britain and North America).