Ahmadis have translated the Qur'an in all the main languages of the world. They broadcast globally on their 24-hour satellite television channels such as MTA 1, MTA 2, MTA 3, (For Arab viewers) and a recently introduced MTA Africa. Ahmadis have provided teachers, doctors and humanitarian relief workers in many developing countries. The fourth Caliph Hazrat Mirza Tahir Ahmad helped to promote homeopathy as a system of medicine by training practitioners through a regular TV class and establishing many free dispensaries around the world. The official Al-Islam website below is a vast online resource of books and videos explaining the movement's beliefs and answering common questions.