Amid continuing tensions in the Central African Republic, rival Christian and Muslim militias in one part of the capital Bangui have declared a truce and shaken hands in public.
In some countries, for example France and Russia, a visiting friend is greeted with a kiss on the cheek; in other countries people greet each other with a firm handshake a loving hug, a bow or simply a nod of the head.
Without any instruction or command, the shooting stopped and German and British soldiers met in no man's land. Photographs were taken and gifts exchanged. It was a Christmas truce.
Its heart beats on, though hearts are gone, That beat like ours, though stronger; Its hands still move, though hands we love Are clasped on earth no longer!
Most people around the world now greet each other by shaking hands, but some cultures use other greetings as well, such as the Japanese, who prefer to bow.
So the next time that you find yourself entering or being pulled into a small group, make sure to make eye contact and introduce yourself to everyone there with the handshake.