Include bibliography.

Revered in eleventh-century Persia as an astronomer, mathematician and philosopher, Omar Khayyam is now known first and foremost for his Ruba'iyat. The short epigrammatic stanza form allowed poets of his day to express personal feelings, beliefs and doubts with wit and clarity, and Khayyam became one of its most accomplished masters with his touching meditations on the transience of human life and of the natural world. One of the supreme achievements of medieval literature, the reckless romanticism and the pragmatic fatalism in the face of death means these verses continue to hold the imagination of modern readers.