Lol, I don’t know when the boomerang was invented, but I think it wasn’t until they got to Australia, otherwise other Negroid Asiatics would use it too, wouldn’t they?
The real secret weapons were probably spear throwers and reed boats.
``DNA from the hair demonstrates that indigenous Aboriginal Australians were the first to separate from other modern humans, around 70,000 years ago-``
``Only then did they spread out and colonise Europe and Asia, but the indigenous Aborigines had been established in Australia for 25,000 years.``
``The boomerang was invented between 25000 to 50000 years ago-``
www.culturequest.us/aboriginal_tools/boomerang.htm
70,000 minus 25,000 equals 45,000 years= coincidence?
``Throwing sticks like boomerangs have been around for more than 15 000 years and were invented independently by a number of different cultures. People in Egypt, Africa, Europe and North America used throwing sticks but the returning boomerang is unique to the Australian Aborigines.``
http://www.questacon.edu.au/indepth/clever/aboriginal_technology.html