On a stage in the United Nations Educational, Scientific, and Cultural Organization headquarters in Paris, Yuri Oganessian holds a microphone in one hand and a small remote control in the other. Over ...

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 ...

This article was updated Friday 11/4 6:00pm. Subscribe to read this story ad-free Get unlimited access to ad-free articles and exclusive content. The periodic table of elements just got a bit heftier ...