In the early 20th century, film reels were often destroyed after their theatrical release, either by accident due to the use of flammable silver nitrate or on purpose in order to recover the silver contained in the film. As a result, an estimated 75-90% of all silent films are lost.
27. J.R.R. Tolkien was a supporter of the constructed language ‘Esperanto’, believing it could help unite Europe after World War 1. He also created new languages like Elvish, calling it his “secret vice”, and explained that for him the purpose was aesthetic rather than pragmatic.
28. Elephants have a specific call to warn the herd of the presence of angry bees.
29. Mapmakers deliberately put slight mistakes in their maps (fake streets, towns) so that they can tell when someone copies them. They are called map traps.
30. Psychosocial dwarfism is a condition where a child can stop growing due to an extremely stressful environment. It can cause the body to completely stop growing but it is generally temporary. Regular growth will resume when the source of stress is removed.