{"footnote":"\u003Cp\u003E  This is something that Google can in theory know. Google Flu Trends uses aggregated search data for flu-like symptoms to estimate the spread of flu pandemics in various countries around the world.  Google published an article in \u003Cem class=\u0022emphasisClass\u0022\u003ENature\u003C\/em\u003E explaining its methodology (\u0026lsquo;we applied the Fisher Z-transformation to each correlation, and took the mean of the 36  Z-transformed correlations\u0026rsquo;), and demonstrated that its tool was as accurate as any existing method of estimating flu levels at any given moment and, since it doesn\u0026rsquo;t depend on health departments\u0026rsquo;  weekly reports, much faster at providing results.\u003C\/p\u003E\n","audio":[],"video":[]}