Data and maps
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Nuclear Mapping [mapping.jp] (Google Earth Plug-in is required) is a real-time visualization of the tweets (purple) and retweets (red) that contain the hashtag #nuclear.
We would like to offer our deepest sympathies to all of those affected by the Great East Japan Earthquake.
Over the weekend I came across some data on levels of radiation in Japan collected by the Japanese government, and helpfully translated into English by volunteers.