Apparently there are genes for pessimism. pen-helm Uncategorized October 13, 2013February 2, 2019 http://www.cbc.ca/news/canada/british-columbia/glass-always-half-empty-your-genes-may-be-to-blame-1.1959903 Share this:TwitterFacebookLike Loading... Related Published October 13, 2013February 2, 2019