In this view, a smile is not genuine or fake, at all. Instead, it is a signal to indicate that we wish to collaborate or bond with someone. Receive a weekly dose of discovery in your inbox!

It revealed that when the gender of the email sender was unknown, recipients were more likely to presume that an email which included a smiley icon was sent by a woman.

The staffer was fired, and Jobs reacted by sending a "smiley face" in an email. The background here ... Read next BI Tech Memo An icon in the shape of an angle pointing down.

He said staff across all of its nearly 3,800 restaurants have received training ... is not mandatory for staff to smile at customers. Read next BI Tech Memo An icon in the shape of an angle ...