Introduction : our cultural Amnesia -- Adena, first civilizers of North America -- Who were the Adena? -- The keltic fingerprint on prehistoric America -- Hopewell masters of ceremony -- Who were the ...
Add Yahoo as a preferred source to see more of our stories on Google. Around 8,000 years ago, many civilizations thrived on plains that are now submerged by the North and Baltic seas. Now, scientists ...
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