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Monday 18 February 2008
Prehistoric Dental Drill-9000 Years
Researchers say prehistoric man invented dental drill 9,000 years ago. Below is an experimental reconstruction photos of a probable method for producing the drilled molar crowns found at a 7000-9000 BP Neolithic graveyard in Mehrgarh, Pakistan.(AP Photo/Luca Bondioli, Pigorini Museum, Rome)
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