• Photo of the day: “A radiation detector marks 0.6 micro-sieverts, exceeding normal levels Tuesday, near Shibuya train station in Tokyo. Concern over possible radiation exposure has increased after a fourth reactor released radiation, Tuesday.” To compare – this level is higher than average, but only a tiny percentage of what’s happening at the plant. 1,000 micro-sieverts per hour equals one milli-sievert per hour. So this is high, but still minor. (Kyodo News/AP) source

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