Anyne know of links which discuss what technologies this ancient civilisation possessed?
like example, how did they manage to make stones float on water?
Floating stones found in Rameshwaram temple
Rameshwaram (Tamil Nadu): Do stones float in water? The answer would be a certain no. But in the island of Rameshwaram in Tamil Nadu, stones, it seems, do float in water. Difficult to believe but it's a reality. Floating stones of Rameshwaram have a mythological twist to it. According to Hindu mythological epic Ramayana, Lord Rama and his army of monkeys used stones to build a bridge across the Palk Strait to link Rameshwaram to Sri Lanka. Legend as well as archaeological findings indicate the first signs of human inhabitation in Sri Lanka date back to the primitive age and it is assumed that the bridge's age is also almost equivalent.
G Mohan Das, a local historian and caretaker of the stones in the temple, said that these stones could have been the kind used to build the bridge mentioned in the epic. "The history of these floating stones is that when Lord Rama made a bridge to trek to Lanka to bring back his consort Sita, these were the same stones used. But today people do not agree to it. They believe it is a coral. We believe there is no difference in these stones. Both the stones do not have air in them. The composition is the same and it has 40 kinds of chemicals," he said. Space images taken by NASA reveal a series of rock outcrops in the Palk Strait between India and Sri Lanka. Some historians say these could be the part of the mythological bridge linking Indian peninsula with the Sri Lankan island.