A Radioactive Cloud from Russia Swept Over Europe and No One Knows Why

A mysterious radioactive cloud that swept through much of Europe this fall has officials baffled.

The cloud was harmless and has dissipated, France’s Institute for Radiological Protection and Nuclear Safety wrote in a statement Thursday, but between Sept. 27 and Oct. 13, the radioactive nuclide Ruthenium 106 was detected in “the majority of European countries.”

Experts aren’t totally sure where the substance came from, though testing suggests it was first released during the last week of September in Russia or Kazakhstan, likely somewhere between Russia’s Volga River and Ural Mountains.

Full Article: MSN