Japan’s Fukushima plant is still too toxic, even for this robot

A robot’s mission to retrieve a radioactive fragment was suspended due to a technical issue that couldn’t be corrected within the safe limits for radiation exposure. An attempt to use an extendable robot to remove a fragment of melted fuel from a wrecked reactor at Japan’s tsunami-hit Fukushima Daiichi nuclear power plant was suspended Thursday due to a technical issue.The collection of a tiny sample of the debris inside the Unit 2 reactor’s primary containment vessel would start the...