Scrum: A Brief History of a Long-Lived Hype

Scrum has been around for a while, they say. The Scrum Guide holds the definition of Scrum, they say. The first, official version of the Scrum Guide was released in February 2010. So, how was Scrum defined before 2010 then? How did its definition evolve before and after 2010 and become the framework that we know today? What else happened along the road to the way that Scrum is defined and represented?