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We had lectures already on the Tsunami, and various earthquakes. Two years ago we developed with the lead epidemiologist at Chernobyl, and a lead scientist from three mile island a lecture on radiation.  Within 10 hours after the disaster in Japan, the lectures were customized and became to top lectures on the web.  We have used google trends to look at the interest curves, and found that there is a window of opportunity but it closes rapidly. The Learning moment only lasts about 48 hours.