How little we know of that time! How many civilizations came and how many civilizations went down, and we do not know about it. How far can we trace back the history of the world? Who can deny that there was once a greater evolution in everything -- art, science, mechanics -- even still more wonderful than we see today. There are a thousand examples to be found in the Mahabharata, the ancient tradition which has been handed down for thousands of years, that Rama came down in Viman, which means in the airplane.