There is a distinctive and easily recognized open-mouth expression that is the canine equivalent of a human smile, illustrated here.

Scientists in Japan have grafted living human skin onto the face of a humanoid ... a team from the University of Tokyo were able to make a robot smile by binding engineered skin tissue to the ...

A smile is one of the most charming gestures there is. In robotics, anticipating facial expressions is highly important for human-robot interaction. Most robots can only recognize and react to ...