CNN —Archaeologists have unearthed the oldest known wooden structure, and it’s almost half a million years old. The wooden structure has no real parallel in the archaeological record, according to the study. The wooden structure was found at an archaeological site upstream of Kalambo Falls in Zambia. Researchers aren’t certain which species of ancient human made the structure and wooden tools, but it is highly unlikely to have been our own. Larry Barham (right), professor of archaeology at the University of Liverpool, carefully uncovers the wooden structure on the riverbank with a fine spray.

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