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.

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Photo source: Courtesy of the John D. and Catherine T. MacArthur Foundation [CC BY 4.0 (], via Wikimedia Commons