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From Scientific American:
Look at a map of the world. Where North America and South America connect there is only a narrow strip of land between the Atlantic Ocean and the Pacific Ocean. That skinny piece of land is called the Isthmus of Panama. For the past 400 years people have wanted to dig a canal through it. If ships sailing between East and West could go through a canal right there, they would not have to go all the way around the end of South America. The trip could be shorter by thousands of miles.
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