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Think of a grain of sand as an empty battery that slowly collects charge once it’s buried.
As long as it remains in the dark it will continue gaining energy over time.
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“This is indeed a marvelous step forward in our exploration of the human past in Australia.”Previous archaeological digs and dating had suggested people migrated to Australia between 47,000 and 60,000 years ago.
But a new excavation at an aboriginal rock shelter called Madjedbebe revealed human relics that dated back 65,000 years.“We were gobsmacked by the richness of material that we were finding at the site: fireplaces intact, a ring of grind stones around it, and there were human burials in their graves,” said Chris Clarkson, an archaeologist from the University of Queensland in Australia and lead author of the study.If researchers can recover the grain of sand, and keep it dark, they can then use a laser to release the ‘charge’ within it.By measuring the amount of energy the grain of sand releases, and comparing that with the amount of radiation that the sand was exposed to while it was buried, researchers can determine when it was last in sunlight.When it was dark, Zenobia Jacobs, a geochronologist from the University of Wollongong, and her colleagues used long tubes to bore into the sand layers where they found artifacts and collected 56 samples.Back at the lab she painstakingly measured more than 28,500 individual grains of sand and used a laser to determine their ages.The timing of the first arrival of humans in Australia has been studied and debated for decades.