The Upanishads are living journals, of students and teachers, of yoga and dao, from time immortal. Rama is closely dated to 2 million years BC, before Christ, while Krishna is closely dated around 2000 BC. The last Upanishad was compiled by Dara Shikoh, the brother of the last Mughal, Aurangzeb, in 1650 AD. When the British invaded India around 1600 - 1650 AD, most of the Upanishads work was stopped. Hence this book is the last Upanishad, the last compilation of all the Upanishads.