It is also a good warning that the people who typically create and edit Wikipedia articles in your local language do not find the subject interesting or are prevented from effectively documenting it due to the language barrier. I was doing research on the history of a certain illness and one physician I was investigating did not have an English Wikipedia article. Of course this does not mean he did not exist, I found him later on the Russian Wikipedia: https://ru.wikipedia.org/wiki/%D0%90%D1%81%D1%82%D0%B2%D0%B0....