Google Zeitgeist is an analytical report of trends in search requests. It provides a wealth of information for the curious. Google Zeitgeist

“Pulling together interesting search trends and patterns requires Google’s human and computing power together. Search statistics are automatically generated based on the millions of searches conducted on Google over a given period of time - weekly, monthly, and annually. With some help from humans, and a pigeon or two when they have time, these statistics and trends make their way from the depths of Google’s hard drives to become the Google Zeitgeist report.” - Google