Random Wikipedia related incident

One of my friends pointed out to our chemistry professor once, that his slides were word for word from that topics Wikipedia page (with a slight tone of "did you plagiarize that") to which the professor responded, that he wrote the Wikipedia article.

My language is quite minor, so I think it's cool that university professors try to make their topic more approachable by creating easy access material in other languages than e.g., English, as well.