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WASHINGTON, Jan. 5, 2015 � Winter weather can mean treacherous driving across much of the country. Road crews spread rock salt all over the highways and byways, but why? This week, Reactions breaks down the chemistry that keeps the roads safe when bad weather hits. Check out the video here: .

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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.