Humans originated in Africa, but when exactly our earliest ancestors left the continent and how they spread around the world has been intensely debated by archaeologists
Two fossils unearthed in a cave in northern Laos suggest that Homo sapiens, our own species, was living in the region some 86,000 years ago, according to a new study. The finding challenges the prevailing idea that humans’ path across the globe was linear and took place in a single wave about 50,000 to 60,000 years ago. “Chances are that this early migration was unsuccessful, but this does not distract from the fact that H.
The researchers measured the luminescence in quartz and feldspar minerals in the sediment layer, a method that reveals how long it’s been since a material with crystalline minerals was heated or exposed to sunlight. As the excavation proceeded deeper, they also found two animal teeth in the same layer as the human remains and dated them by measuring the radioactive decay of uranium isotopes — chemical elements found in the tooth enamel — in a technique called electron-spin-resonance dating.
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