http://www.nma.gov.au/defining-moments/resources/earliest-evidence-of-the-boomerang-in-australia
"Australia was not the only place in the world where throwing sticks like the boomerang developed. A 23,000-year-old mammoth tusk carved in a shape similar to the boomerang was discovered in Poland in 1986.

The oldest Australian boomerangs yet discovered were found in Wyrie Swamp, South Australia, in 1973 and have been dated to about 10,000 years ago.

However, the oldest images of boomerangs in Australia are found among the Bradshaw/Gwion Gwion rock art paintings in the Kimberley, and are about 20,000 years old."

"However, the oldest images of boomerangs in Australia are found among the Bradshaw/Gwion Gwion rock art paintings in the Kimberley, and are about 20,000 years old."

That's really interesting, Josephus. Thanks for that.

It is quite clear that the society that created the Bradshaw paintings was very different to the aboriginals that replaced them. What happened to those people will never be known but extermination at the hands of less advanced but more violent tribes seems likely. Given that the Bradshaw people were more advanced in their arts, it seems likely that they were more advanced in other areas. That they passed on boomerang technology to the aboriginals seems more than plausible.

Dear Josephus,

I don't understand WHY you keep on barking and banging
on about stuff that has nothing to do with the coming
up Referendum for our First Peoples Voice to Parliament.

All people are being asked to do is vote YES or NO on
ONE single question:

"A proposed Law to alter the Constitution to recognize
the First Peoples of Australia - by establishing an
Aboriginal and Torres Strait Islander Voice.

Do you approve this proposed alteration?"

That's it.

Why are you bringing in all this other stuff that has
NOTHING to do with the Referendum?

It does not make any sense.

Dear mhaze,

Same applies to you.

Hi Foxy,

You ask; I don't understand WHY you (Josephus) keep on barking and banging on about stuff that has nothing to do with the coming
up Referendum for our First Peoples Voice to Parliament.

Could it have anything to do with the fact he has demonstrated his bigoted racism towards Aboriginal people on the forum, time and again.

Jose' claimed that he lived in Northern NSW in the 1960's where there were harmonious relations between whites and blacks, he spoke of social events. When I asked how mixed social event he attended, he went silent. Like the rest of the Klan they were all racists.

Dear Fester,

«Do you see the contradiction there? In developed nations where women have more rights and education you don't see high birth rates.»

This is not a contradiction but only a drop in the ocean because despite it, most women still have babies.
The main reason for the reduction in birth-rate is the density and hardships of urban life, which is not suited for having children.
One could even add the factor of sophisticated-technology-driven pornography replacing the desire for real sex, but even all these taken together would not suffice to reduce human population significantly enough, only to keep it relatively stable around today's levels.

«So contrary to your opinion that sophistication is the cause of a growing population, it is in fact the case that the denial of sophistication (birth control and education) that is the cause.»

But why deny birth control and this particular education? Among all sophisticated things that already exist, they should be among the last things to go, which will occur naturally once population has sufficiently declined.

«The reality Yuyutsu is that many do not share your concerns of overpopulation. Some even think a growing population a big advantage as it provides cheap labor to keep their economies strong.»

In other words, they play a Ponzi scheme, which future generations will have to pay for, and have their dignity stripped away as they be considered as nothing but "cheap labor".