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WASHINGTON, June 27, 2018 � It has been called the smelliest food in the world. But surströmming � Swedish for “sour herring� � is beloved in Sweden as a summer treat. In this video, Reactions explains the chemistry of how to preserve herring and why it smells so strong, with help from H.E. Karin Olofsdotter, Swedish ambassador to the U.S., and her team: .

Reactions is a video series produced by the American Chemical Öйú365betÖÐÎĹÙÍø and PBS Digital Studios. Subscribe to Reactions at and follow us on Twitter .

The American Chemical Öйú365betÖÐÎĹÙÍø, the world’s largest scientific society, is a not-for-profit organization chartered by the U.S. Congress. ACS is a global leader in providing access to chemistry-related information and research through its multiple databases, peer-reviewed journals and scientific conferences. ACS does not conduct research, but publishes and publicizes peer-reviewed scientific studies. Its main offices are in Washington, D.C., and Columbus, Ohio.