He may have a point, human progress may not be a smooth curve upwards, but might rise and fall, with advanced civilisations collapsing with little trace other than half remembered fables, and the odd clue here and there.

I wondered if today’s mass extinctions of the large mammals, which is looking irreversible, reflects the mass extinctions of dinosaurs. We know what is causing today’s extinctions - the rise of an intelligent monkey. ( us ) The species of dinosaurs discovered so far include those of today’s mammals, I.e. grazers and predators, so I await the discovery of the remains of a monkey type dinosaur with some excitement. Did a dinosaur ‘human’ arise as we have, wipe out the other major dinosaurs only to vanish with little trace ?

A true scientist keeps an open mind about these things - especially after the flat earth theory humiliation, from which science has not yet fully recovered ! : ) Historians do not (yet) seemed to have had such a humiliation, but may do some awful day.

So, yes, I think Professor Y Sudershan Rao might be right, possibly, could be, you never know, feasible, not completely absolutely irrefutably without doubt categorically impossible. Ahem.

: )