A handshake is a short ritual in which two people grasp one of each others like hands, in most cases accompanied by a brief up and down movement of the grasped hands. Using the right hand is generally considered proper etiquette. Customs surrounding handshakes are specific to cultures. Different cultures may be more or less likely to shake hands, or there may be different customs about how or when to shake hands. Handshakes are known to spread germs. Archaeological ruins and ancient texts show that handshaking was practiced in ancient Greece as far back as the 5th century BC; a depiction of two soldiers shaking hands can be found on part of a 5th-century BC funerary stele on display in the Pergamon Museum, Berlin (stele SK1708)[unreliable source?] and other funerary steles like the one of the 4th century BC which depicts Thraseas and his wife Euandria handshaking (see images on the right). The handshake is thought by some to have originated as a gesture of peace by demonstrating that the hand holds no weapon.