Indian Mythology vs Science

Indian mythology is one of the oldest of the world. They are rich with culture and traditions which teach important lessons. But some people still question the actual existence of those stories and their characters and rightfully so. But,upon wondering I came with a few questions which I am unable to answer. And this concerns Indian mythology as well as The Brahmins of the Vedic Age..

1. Ramayana and Mahabharata are two great epics of India and these stories are seperated by eons of time. But, some characters are common in them. Hanuman, Parashuram and Vishnu’s Garuda. How did these characters live in both the epics? Coming to science vs mythology now. All these characters have one thing common in them which is that they can travel at the speed of thought. According to the Einstein’s theory of relativity- If anything travels faster than light then it observes time passing slower than it’s static counterparts. Does that mean that the Brahmins who wrote these epics knew about this theory before Einstein and so they incorporated these characters?

2. In the 16th century, Galileo said that the earth is round. These epics were written long before that and yet it talks about the Earth being a sphere and they talked about the navagraha or the nine planets. How did these authors know about this before the discovery of telescope?

3. The Sushruta Samhita a book written by the Vedic surgeon Sushruta talks about various surgeries including the cataract eye surgery very closely. How did they do it without anaesthesia?

Ponder on them and let me know.