The finding of the ancestor of the dingo, the different tool-making techniques and similarities between the aboriginal Australians genome and Indians suggest that these last ones migrated to Australia 4000 years ago.
This discovery discards the idea the idea of the isolation of Australians from the rest of the world until eighteenth century; as it was thought.
Scientists want to compare more examples of genome to find more signs of genetic flow but aboriginal people refuse to do it.
http://www.nature.com/news/genomes-link-aboriginal-australians-to-indians-1.12219
Curiosities of physical anthropology 