Jaafar As-Sadiq did not excel only in Islamic studies. He was keenly interested in other sciences, particularly chemistry, physics and astronomy. One of his main students in these disciplines was Jabir ibn Hayyan, who excelled in chemistry and mathematics. Apparently he had a special time allocated for him by As-Sadiq when he was his only student, which suggests that they were studying disciplines that are not easily understood by many people. Jabir ibn Hayyan wrote many pamphlets on various scientific disciplines, fifty of these have clear references to what he learnt from Jaafar As-Sadiq.