NASA: "We've discovered a previously unknown surprise circling Earth"

This is wild. NASA's recently deployed Van Allen probes — a pair of robotic spacecraft launched just last August to investigate Earth's eponymous pair of radiation belts — are already turning out some very unexpected findings. Chief among them: an ephemeral third ring of radiation, previously unknown to science,… » 2/28/13 1:30pm 2/28/13 1:30pm