If we want to live in a world where we interact with robots, they'll have to be able to read and respond to our facial expressions in lightning-fast time. <br /><br />Now, scientists have come a step closer to creating such an advanced machine. <br /><br />'Emo', built by experts at Columbia University in New York, is the fastest humanoid in the world when it comes to mimicking a person's expressions. <br />
