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Karl Ziegler won the Nobel Prize in Chemistry in 1963 for his work on the Ziegler-Natta polymerization process. This process allows for the production of high-density polyethylene and polypropylene, which are two of the most common plastics in the world. Ziegler's work on this process has had a profound impact on the global economy and has made it possible for us to use plastics in a wide variety of products.