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Eastern Orthodox Christianity claims an unbroken Apostolic Succession back to the Apostles, with grace transferred through the laying on of hands. Though many nationalities are represented in Orthodoxy, which present a number of slight cultural differences, the jurisdictions of the Orthodox Church are identical in belief, and spiritually one in Christ Jesus.

The variety in Greek religion is also caused by the long history of Greece. Greek religion spans a period from Minoan and Mycenean periods to the days of Hellenistic Greece and its ultimate conquest by the Roman Empire. Religious ideas continued to develop over this time; by the time of the earliest major monument of Greek literature, the Iliad attributed to Homer, a consensus had already developed about who the major Olympian gods were. Still, changes to the canon remained possible; the Iliad seems to have been unaware of Dionysus, a god whose worship apparently spread after it was written, and who became important enough to be named one of the twelve chief Olympian gods.

It is sometimes difficult to determine which ideas Pythagoras taught originally, as opposed to the ideas his followers later added. While he clearly attached great importance to geometry, classical Greek writers tended to cite Thales as the great pioneer of this science rather than Pythagoras. The later tradition of Pythagoras as the inventor of mathematics stems largely from the Roman period.

In astronomy, the Pythagoreans were well aware of the periodic numerical relations of the planets, moon, and sun. The celestial spheres of the planets were thought to produce a harmony called the music of the spheres. These ideas, as well as the ideas of the perfect solids, would later be used by Johannes Kepler in his attempt to formulate a model of the solar system in his work The Harmony of the Worlds. Pythagoreans also believed that the earth itself was in motion.

The number of Greek students studying at European institutions is increasing along with EU support for educational exchange. In addition, nearly 5,000 Greeks are studying in the United States, about half of whom are in graduate school. Greek per capita student representation in the U.S. is the highest of any European country.

Greece has various, if not numerous, linguistic and cultural minorities. A non-comprehensive list of these would include various Roma groups, Turkish-speakers, Slavs, and Vlachs, (Aromanians and Megleno-Romanians). Numerous religious minorities exist: Muslims form the largest such minority.