Photo: Ancient Stone "Tools" Found; May Be Among Americas' Oldest

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Features of the 2.5-inch-long (6.5-centimeter-long) stone seen here suggest to archaeologists that the object could be a crude stone knife.

The find is among 50 artifacts found at a Minnesota construction site that might be tools made by humans at least 13,000 years ago. If confirmed, the relics would be among the oldest known in the Americas.

Photograph courtesy Leech Lake Heritage Sites

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