Mood tracking tools
Type in a word or phrase in one of seven languages (English, French, German, Spanish, Hebrew, Russian, Chinese) and see how its usage frequency has been changing throughout the past few centuries. Addictive. Note: the dataset's quality is highest for English between 1800 and 2000.
Google Flu Trends We've found that certain search terms are good indicators of flu activity. Google Flu Trends uses aggregated Google search data to estimate current flu activity around the world in near real-time. Each week, millions of users around the world search for health information online. As you might expect, there are more flu-related searches during flu season, more allergy-related searches during allergy season, and more sunburn-related searches during the summer. You can explore all of these phenomena using Google Insights for Search.