Green

Russian researchers in Antarctica are on the verge of piercing a hole through two miles of ice into an ancient lake, untouched by the light of day for some 20 million years. But it'll be a delicate process to break through without disturbing the pristine waters. Guest host David Green speaks with Antarctic researcher John Priscu about the process.

Sturgeon have been swimming around for more than 200 million years, but their eggs are sought after for caviar. This week, the National Marine Fisheries Service placed the Atlantic sturgeon on its endangered species list. Guest host David Greene speaks with Dr. Ellen Pikitch, executive director of the Institute for Ocean Conservation Science at Stony Brook University.

For snow fans in the contiguous US, this winter has left much to be desired. The warm and mild season in the lower 48 and the wild snow dumps and cold weather up north in Alaska can be blamed largely on a weather pattern called "arctic oscillation." Audie Cornish gets an explanation of the weather phenomenon from meteorologist Jeffrey Masters.