Probing further and further into the scientific attainments of the sages of ancient India, the construction of Vimanas, vehicles capable of flying in space, is described by Sages Bharadwaja. Mental Science had advanced so much that they could reproduce what had happened or predict what would happen. The Science of Medicine was highly developed in India. It was Sage Bharadwaja who taught this science for the benefit of mankind. Sage Atreya took up the task of propagating this science and technique of healing. Saint Charaka compiled all the discoveries into a Samhita or ‘collection’ named after him. It deals elaborately with the diagnosis of diseases, methods of healing and cure, foetal development and other essential but not easily discoverable facts of medical sciences. The doctors proficient in that science could, in those ancient years, surgically remove or correct various diseased parts of body when the illness could not be cured by drugs. Saint Susruta has written in his compendium on many surgical processes. This text has been discovered and is available for study. Dhanvantari, Nagarjuna and other sages have brought to light many other medical discoveries of Ancient India, made by adherents of Vedic tradition of scientific research. There are also many valuable texts on ethics, jurisprudence and other social sciences which are invaluable treasures for all times, like the Dharma Shastra of Manu and Nyaya Shastra of Gautama. (SSVahini, p. 185)