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At the end of Word War II, the proverbial “Iron Curtain” fell between Western Europe and the Soviet Union. The barrier, which was as much a real obstacle—defended by soldiers and tanks—as it was a symbolic divide, prevented travel, trade, and communication between the two halves of the continent.

Now, new research is suggesting that the barrier intended to isolate people and economies, also worked to keep invasive species out…. Read the full story on TreeHugger
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