Klaus Dona is an Austrian artifacts researcher. Human history as taught in schools is incorrect. Much of ancient history is hidden from the masses. Ancient humans were far more advance in technology than stated. Much of their technology are more advance than even what we have today. There is evidence of a single worldwide language pre Sanskrit.
Were there an ancient race of giants Nephilim ? Were there a reptilian humanoid race? Klaus Dona provides factual evidence and also many skull samples of humanoid giants.