The pitch of each consecutive fret is defined at a half-step interval on the chromatic scale. Standard classical guitars have 19 frets and electric guitars between 21 and 24 frets, although guitars have been made with as many as 27 frets. Frets are laid out to accomplish an equal tempered division of the octave.
Guinness World Records lists the Mona Lisa as having the highest insurance value for a painting in history. On permanent display at The Louvre museum in Paris, the Mona Lisa was assessed at US$100 million on December 14, 1962. Taking inflation into account, the 1962 value would be around US $780 million in 2014 dollars
By 285 CE the Roman Empire had grown so vast that it was no longer feasible to govern all the provinces from the central seat of Rome. The Emperor Diocletian divided the empire into halves with the Eastern Empire governed out of Byzantium (later Constantinople) and the Western Empire governed from Rome.
Albert Einstein was married two times. He married Mileva Maric (1875-1948) in January 1903, a former fellow student from his time as a student at the Polytechnic in Zurich. They were divorced in February 1919. 4 months later, in June 1919, he married his cousin Elsa Löwenthal (1876-1936), nee Einstein.