U.S. Flu Map from Google Flu Trends: Yep, it's going around.
Our readers in the U.S. may be wondering if they have noticed an unusually high level of colds and flu activity this winter. These Google.org Flu Trends graphics prove that it's not all in their (stuffed up) heads. Get this: Google has found that search activity is a good estimator of the prevalence of flu: "We have found a close relationship between how many people search for flu-related topics and how many people actually have flu symptoms." Google Flu Trends is updated every day. Read more about the U.S. flu outbreak in today's NYTimes. -- Bill Paarlberg, editor