1. Arya Samaj is a monotheistic Hindu reform movement in India that promotes principles and practices based on belief in the infallible authority of the Vedas.

2. Maharishi Dayanand Saraswati founded the society on April 10, 1875.

3. Arya Samaj follows the belief that there is only one God and his idol worship is not appropriate.

4. Arya Samaj was the first Hindu organization to promote proselytism.

The headquarters of the United Nations Industrial Development Organization (UNIDO) is situated in Vienna, Austria. UNIDO is a specialized agency of the United Nations that focuses on promoting and accelerating industrial development in developing countries. It works to enhance economic growth, reduce poverty, and improve living standards by fostering sustainable industrialization. The choice of Vienna as the headquarters reflects the city's historical significance as an international diplomatic and organizational hub.