http://www.sciencedaily.com/releases/2015/02/150209161143.htmArabic movie subtitles, Korean tweets, Russian novels, Chinese websites, English lyrics, and even the war-torn pages of the New York Times – research examining billions of words, shows that these sources – and all human language – skews toward the use of happy words. This Big Data study confirms the 1969 Pollyanna Hypothesis that there is a universal human tendency to "look on and talk about the bright side of life."