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Acheulean stone tools are the products of , a closer ancestor to modern humans.

Not only are the Acheulean tools found over the largest area, but it is also the longest-running industry, lasting for over a million years.

Knowing when a dinosaur or other animal lived is important because it helps us place them on the evolutionary family tree.

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The tools, whose makers may or may not have been some sort of human ancestor, push the known date of such tools back by 700,000 years; they also may challenge the notion that our own most direct ancestors were the first to bang two rocks together to create a new technology.

The absolute dating method first appeared in 1907 with Lord Rutherford and Professor Boltwood at Yale University, but wasn’t accepted until the 1950s.

The first method was based on radioactive elements whose property of decay occurs at a constant rate, known as the half-life of the isotope.

"The whole site's surprising, it just rewrites the book on a lot of things that we thought were true," said geologist Chris Lepre of the Lamont-Doherty Earth Observatory and Rutgers University, a co-author of the paper who precisely dated the artifacts.

The tools "shed light on an unexpected and previously unknown period of hominin behavior and can tell us a lot about cognitive development in our ancestors that we can't understand from fossils alone," said lead author Sonia Harmand, of the Turkana Basin Institute at Stony Brook University and the Universite? Hominins are a group of species that includes modern humans, Homo sapiens, and our closest evolutionary ancestors.

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