Google introduced an experimental new tool Google Correlate on Google Labs which is useful for researchers to model the behavior of the real world using search trends. Like Google Flu Trends, Google Dengue Trends you can get the data of all kinds like Public Health Economics and more. see an example: What does baseball have in common with gazebos?.
It uses web search activity data to find queries with a similar pattern to a target data series. The results can be viewed on the Google Correlate website or downloaded as a CSV file for further analysis.
This tool is helpful to alert people from various diseases which affects about millions of people each year.
Learn more about this at http://correlate.googlelabs.com/
Image courtesy: Correlate Comic Book