Google celebrates 15 years of search today. In 1998, it was located in a garage at 232 Santa Margarita, Menlo Park. Today, the tech giant has much nicer real estate, the massive Googleplex in Mountain View, not to mention a global ecosystem of software, hardware, and moon shot projects. But Google's bread and butter has always been search, and the company has given itself a birthday present -- a big update to it's search algorithm. Will Oremus of Slate Magazine has been following the changes and tells Marketplace Tech all about them.