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WASHINGTON, Sept. 29, 2014 � Oktoberfest is here, and that means beer. And there’s nothing worse than reaching for a cold one, taking that first sip and realizing your beer’s been skunked: chemicals have reacted to form compounds that cause an awful, bitter taste. This week, Reactions explains why beers get skunky, and what you can do to keep your brews from going bad. Learn all about it at .

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The American Chemical Öйú365betÖÐÎĹÙÍø is a nonprofit organization chartered by the U.S. Congress. With more than 161,000 members, ACS is the world’s largest scientific society and a global leader in providing access to chemistry-related research through its multiple databases, peer-reviewed journals and scientific conferences. Its main offices are in Washington, D.C., and Columbus, Ohio.