I was just reading some stuff about human migration, including the hypothesis that Madagascar was colonised by Malaysians in ancient times and that the ancestors of Polynesians today are believed to have come from Taiwan. With this in mind, is it possible that these places could have been colonial powers in prehistoric times that have gone undocumented by history? There are also other places such as Tartessos in southern Spain which was supposedly a major tradeport in a time that we now know little about. With prehistory stretching such a long span of time, is it possible that for much of it there were always a handful of civilisations on the planet that lived in a relatively modern manner compared to the rest of the world? Or is this a tad ASB to contemplate?