Positivity Bias in the English Language (IMAGE) University of Vermont Caption These are graphs showing the distributions of happiness scores for the 5,000 most frequently used words in four sources: the New York Times, Twitter, Google Books, and music lyrics. The yellow shade indicates words with average happiness scores above the neutral value of 5, gray those below. Credit University of Vermont, published in <I>PLoS ONE</I>, January 11, 2012 Usage Restrictions to be used with associated article and credit line License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.