You may not believe all this but look at the flight of imagination of our ancestors, how high they could go. Similarly in various fields of science e.g. in Medicine Sushruta invented plastic surgery 2000 years ago. In plastic we do not use plastic, we take one part of the body and put it in another part. For instance, in a by-pass heart operation, we take a vein from the man's leg and put it into his heart, because the immune system will not reject. This was invented 2000 years ago by Sushruta. Westerners invented it only 200 years back. If you go to the London Science Museum you will find one whole gallery displaying about 40-50 surgical instruments used by Sushrut. Thus, Indians were far ahead of Westerners in medicine. In astronomy, the calculations which were made 2000 years ago are still the basis of predicting with great accuracy the day and time of a Surya Grahan (Solar Eclipse) or Chandra Grahan (lunar eclipse) by reading a 'patra'. These calculations were made 2000 years ago by our ancestors who did not have telescopes and modern instruments but by sheer observation by the naked eye and the power of intellect they predicted what is going to happen 2000 years in the future. This was the scientific level which we had reached in the past, we were far in advance of Westerners in science and technology at that time.
meree suno jo gosh-e-naseehat_niyosh hai"