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The rare radioactive substance made its way from the United States to Russia on a commercial flight in June 2009. Customs officers balked at accepting the package, which was ensconced in lead ...

See more of our trusted coverage when you search. Prefer Newsweek on Google to see more of our trusted coverage when you search. This year is the International Year of the Periodic Table of Chemical ...

This lesson utilizes an adaptation of the board game Periodic: A Game of the Elements to help students better understand both general periodic trends and the law of conservation of energy. This ...