You Can Hear A Smile. When You Do, You'll Smile Back.

Seeing a smile can make a person unconsciously smile in return, and now scientists find that digitally mimicking the voice of a smiling person can also make people reflexively smile.Charles Darwin and his contemporaries were among the first scientists to investigate smiles. Darwin suggested that smiles and several other facial expressions are universal to all humans, rather than unique products of a person's culture."There is evidence that smiles are a profoundly deep gesture in the