This III part of essays in the series "The Science Genius Muhammad Nasiraddin Tusi": Nasiraddin Tusi is an outstanding scholar-encyclopaedist of the 13th century who contributed greatly to the development of all branches of knowledge of his era. The fame of this great personality and scientist, who left an indelible mark in science, with his successes and achievements gave a huge impetus to the future development of world science, has spread all over the world. It was a time when science, literature, art and culture flourished. To get acquainted with the works of famous scientists of antiquity and the Middle Ages, Tusi is studying simultaneously several languages and at the same time has a deep knowledge of different fields of science.It was an era when Azerbaijan was famous throughout the Middle East for its brilliant and famous scientists: Babakuhi Bakuvi, Shihabaddin Sukhraverdi, Hatran Tabrizi, Khatib Tabrizi, Afzaladdin Khagani, Adjami Nakhchivani, M. Zendjani, Sheikh Nizami Ganjavi, Mehseti Ganjavi and others.