The boomerang was not invented in Australia [1]. Woomeras don't allow you to throw a spear 800m (200m at most). These were not invented in Australia either [2].

The boomerang was not invented in Australia [1]. Woomeras don't allow you to throw a spear 800m (200m at most). These were not invented in Australia either [2]. Both are really ancient technologies. As for different cultures sharing the same stories is no more surprising than people in England and China sharing similar stories. All pre-agricultural people have somewhat similar lives so we should expect they have similar stories and myths. Occam's razor should rule here. 1. https://en.m.wikipedia.org/wiki/Boomerang https://en.m.wikipedia.org/wiki/Boomerang 2. http://www.donsmaps.com/atlatl.html http://www.donsmaps.com/atlatl.html