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The ancient shark tooth blades were most likely used in warfare, or for ritual purposes, according to the researchers.
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Archaeologists discover 7000-year-old knives made of tiger shark teeth on Sulawesi island - photo
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7,000-Year-Old Shark-Tooth Knives Unearthed in Indonesia
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7,000 Year Old Shark Tooth Knife Found in Sulawesi
Shark Teeth as Ancient Blades: 7,000-Year-Old Weapons in Indonesia [Paper]
Bringing a shark to a knife fight: 7,000-year-old shark-tooth knives discovered in Indonesia
Denmark's Oldest Runic Inscription Found on the Blade of a 2,000-Year-Old Knife