http://healthypets.mercola.com/sites/healthypets/archive/2015/01/06/rats-regret-poor-choices.aspx?e_cid=20150106Z1_PetsNL_art_1&utm_source=petnl&utm_medium=email&utm_content=art1&utm_campaign=20150106Z1&et_cid=DM66222&et_rid=794705328
Surprising Discovery: Important Human Emotion Found in Unlikely Species