Google began in January 1996 as a research project by Larry Page and Sergey Brin when they were both PhD students at Stanford University in Stanford, California.While conventional search engines ranked results by counting how many times the search terms appeared on the page, the two theorized about a better system that analyzed the relationships between websites. They called this new technology PageRank; it determined a website's relevance by the number of pages, and the importance of those pages, that linked back to the original site. Page and Brin originally nicknamed their new search engine "BackRub", because the system checked backlinks to estimate the importance of a site. Eventually, they changed the name to Google, originating from a misspelling of the word "googol", the number one followed by one hundred zeros, which was picked to signify that the search engine was intended to provide large quantities of information. Originally, Google ran under Stanford University's website, with the domains google.stanford.edu and z.stanford.edu. The domain name for Google was registered on September 15, 1997, and the company was incorporated on September 4, 1998. It was based in the garage of a friend (Susan Wojcicki) in Menlo Park, California. Craig Silverstein, a fellow PhD student at Stanford, was hired as the first employee. In May 2011, the number of monthly unique visitors to Google surpassed one billion for the first time, an 8.4 percent increase from May 2010 (931 million). In January 2013, Google announced it had earned US$50 billion in annual revenue for the year of 2012. This marked the first time the company had reached this feat, topping their 2011 total of $38 billion. The company has reported fourth quarter (Dec 2014) Earnings Per Share (EPS) of $6.88 – $0.20 under projections. Revenue came in at $14.5 billion (16.9% growth year over year), also under expectations by $110 million.