"Medicine was absent until Hippocrates created it, dead until Galen revived it, dispersed until Rhazes (al-Razi) collected it, and deficient until Avicenna (ibn Sina) completed it." De Poure, European physician. "Al Zahrawi, without doubt the chief of all surgeon," Pietro Argallata "Avicenna (Ibn Sina), the most famous scientist of Islam and one of the most famous of all races, places and times." George Sarton The pulmonary circulation was correctly described by Ibn Nafis 300 years before William Harvey. 600 years before scientist in the West, al-Biruni correctly calculated the diameter of the Earth as 6339 km (3939 miles). "I was fervently attached to the pursuit of the subtle science and persisted in the endeavor to arrive at the truth. The eyes of opinion located to me (to) distinguish myself in this beloved scince. Types of [machine] of great importance came to my notice, offering possibilities for types of marvellous control....