Linux was started 25 years ago in Finland by Linus Torvalds. Look at the history and reasons why it started revolution. Today linux rules on servers, smart phones and embedded systems.
After that you should also read Linux at 25: Q&A With Linus Torvalds article where the creator of the open-source operating system talks about its past, present, and future. Linus Torvalds created the original core of the Linux operating system in 1991 as a computer science student at the University of Helsinki in Finland.