well,I've seen much enthusiasm on this single lecture in this forum.let me say it that the lecture was on "Vimanas".whether it ever existed or not,that was entirely a different thing,but it should not be part of this Science Congress event.
Vimanas was in the discusson for long.actually,Vimanas was not UFO type modern conecpt.it was in fact well documented.one of the mention of this was found on Alexander's account.Alexander the Great purportedly gave a description of "dozens of silver disk-like objects" entering and leaving the Jaxartes River in 337 BC. Alexander, so the story goes, then became obsessed with the craft and spent many hours in a primitive diving bell searching for them. (Source: History Channel "Unidentified Submarine Objects")
but thats part of Mythology,I don't understand why they even let this into discussion.