This may sound general but I chose to research Google. For example who came up with the idea to create a source that can search almost anything? How long has things like this been running? Why are there so many search engines yet non ever takes over google?
Through research I learnt that Google is a play on the word googol which means a very large number which makes sense as Google stores a very large number of sources, facts, pictures and websites etc.
Google only began in January 1996 as a research project of Larry Page, who was then joined by Sergey Brin. “Their search engine was originally nicknamed "BackRub" because the system checked backlinks to estimate a site's importance.”
Yahoo became before Google as there is history before the makings of Google, and it is known that if Bill Gross hadn't made Yahoo there may have never been Google. Even though Yahoo came before Google, it is still peoples top choice, some people say this is because it is easier to use.
This website shows a time line of how google was created. http://www.google.com/corporate/history.html