Guest essay by Don Easterbrook

A crater in northern Siberia, spotted by a passing helicopter, has received worldwide attention and continues to be a top news story. Since then, two more mysterious holes have been discovered elsewhere in the region. Now the new holes, smaller in diameter but similar in shape – are posing a fresh challenge for Russian scientists, according to the The Siberian Times. Theories range from meteorites to an explosion of methane due to global warming.