Olympiad mind-sports, such as the Science Olympiad, Mindsport Olympiad, Chess Olympiad, International History Olympiad and Computer Olympiad. In these cases "Olympiad" is used to indicate a regular event of international competition for top achieving participants; it does not necessarily indicate a four-year period. In some languages, like Czech and Slovak, Olympiad () is the correct term for the games. "The Olympiad" ("L'Olimpiade") is also the name of some 60 operas set in Ancient Greece. Olympiad An Olympiad (, "Olympiás") is a period of four years associated with the Olympic Games of the Ancient Greeks. During the Hellenistic period, beginning with Ephorus,
How many angels can dance on the head of a pin? about how many could perch at the same time on the head of a pin"". Dorothy L. Sayers argued that the question was "simply a debating exercise" and that the answer "usually adjudged correct" was stated as, "Angels are pure intelligences, not material, but limited, so that they have location in space, but not extension." Sayers compares the question to that of how many people's thoughts can be concentrated upon a particular pin at the same time. She concludes that infinitely many angels can be located on the head of a pin, since they do not occupy any space there: