Recent analysis of scientific data from two major archaeological and satellite-based studies by international teams, has conclusively proved that most of the old world civilizations of India, Mesopotamia, Egypt, and Aegaen perished simultaneously around 2200 B.C. because of a prolonged natural calamity which persisted for about 300 years.1 The studies have proved that there was no Aryan invasion that broke up Harrappan civilization, but in fact, it was the last days of the age of Rig Veda. The Vedic Harappans had a high level of scientific and technological knowledge more than 2000 years before the Greeks or Romans. David Frawley has shown in his book "Vedic Aryans and the origins of civilization" that the Rig Veda belongs to an earlier layer of civilization before the rise of the civilization of Egypt, Mesopotamia and the Indus Valley Harappa. It appears that the most probable dates of Rig Veda age is 6500 B.C to 2200 B.C. It may even be earlier.
A distinguished American mathematician A. Seidenberg has shown that the Sulba Sutras are the source of both Egyptian and old Babylonian mathematics. The Sulba Sutras are part of the Vedic religious literature known as Kalpasutras. They were created originally to serve as technical manuals for the design and constuction of vedic altars. The Sulba Sutras are the oldest mathematical texts known. They state the famous Pythagorean theorem in geometry fully two thousand years before Pythagoras.
Most of the Vedic knowledge was handwritten on palm leaves or preserved by oral tradition. Some texts have been destroyed, some sold to or stolen by foreigners and some are kept hidden by individual families who are scattered all over India. The main texts contain fundamentals of knowledge including basic sciences and or technological applications. The details of the processes, proofs are most likely contained in subsidiary texts. We need to work hard to dig out all this knowledge. Quite a large amount of knowledge, based on the original Vedic knowledge which perished around 2200 B.C. is found in the first revival in the first 8 centuries A.D. The subjects like knowledge, Science, wisemen, Scientists, physical world, life, salvation were very important in the Vedic and post vedic ancient India. The terms used were Jnana, Vijnana, Jnanin, Vijnanin, Bhautika Jagat, Jivana, Moksa. I wish to highlight the fact that the Vedic seers and Vedic civilization understood the importance of Vijnana (Science) and even considered it more important than Jnana (Knowledge).