Original Story in Science News: <a href="https://www.sciencenews.org/blog/culture-beaker/few-key-signs-betray-betrayal" rel="nofollow">https://www.sciencenews.org/blog/culture-beaker/few-key-sign...</a><p>Paper: <a href="http://vene.ro/betrayal/niculae15betrayal.pdf" rel="nofollow">http://vene.ro/betrayal/niculae15betrayal.pdf</a>