Though ice skating has been around for centuries, it only came into its current form and fashion in the mid-19th century and was still taking shape as a professional and competitive sport when Charlotte Oelschlägel (1898 - 1984) wrote The Hippodrome Skating Book in 1916.
Most of us learned in school that Johannes Gutenberg invented the printing press, which is not entirely accurate. He is, however, conventionally credited with inventing the process of mass-producing individual pieces of type. These innovations in moveable type allowed for books to be efficiently produced in large quantities and revolutionized the human ability to share ideas. This post explains the multi-step process of mass-producing metal letters to be used in printing texts.
Before today's thin, brittle paper made from wood pulp became standard, paper was handcrafted by experts using linen rags as the essential material. This post explains the process by which rag paper was made in Europe for centuries.