This week in science: Learn about the alarming decline of butterfly populations in America and the rare opportunity to spot Mercury in the evening sky. Plus, a look at the polar vortex collapse. Read more...

A dead royal python found in Poland, a potentially erupting volcano in Romania that could affect Poland, and a polar vortex bringing pearl clouds are among the unusual science stories. Read more...

From a tragic accident involving a young girl to a mysterious death investigation and wild weather swings, the UK faces a week of unsettling news. Read on for the latest updates. Read more...

A roundup of recent science news including a polar vortex affecting Poland, cave contamination in the Balearic Islands, Czech space probe advancements, Hunnic origins, forest fire research, and Gulf Stream studies. Read more...