The Aboriginals would have given those people the knowledge re the boomerang on one of their many voyages throughout the ancient World.
They had large Fleets of explorational vessels that they had over 100,000 years ago.
They used to use these Vessel to spread their massive wealth of knowledge in regard to building cites, bridges, commercial fishing, astronomy, space travel, mining, flight etc etc etc.
Without the Australian Aboriginals the world and our universe would not be what it is today.
This is all common knowledge today and is possibly taught to our kids at school here in Oz.
Bruce pascoe is the go to chap in regard to this knowledge.
