Researchers at MIT's Computer Science and Artifical Intelligence Lab (CSAIL) have created a device they call the EQ-Radio, which can pick up emotions including excitement, sadness, anger and happiness with around 87% accuracy. The system trains on a person’s individual emotions before attempting to guess their current state, all without any on-body monitors. The research was led by MIT professor Dina Katabi.

Article source: https://techcrunch.com/2016/09/20/this-mit-device-can-tell-if-youre-happy-sad-or-angry-using-wireless-signals/

Photo source: Courtesy of the John D. and Catherine T. MacArthur Foundation [CC BY 4.0 (http://creativecommons.org/licenses/by/4.0)], via Wikimedia Commons