More than two and a half years have passed since an earthquake and tsunami caused a nuclear meltdown at the Fukushima Daiichi power plant in Japan. This week, the cleanup process enters a new chapter. Workers have begun the tricky but essential task of removing fuel rods from one of the reactor units there. Arne Gundersen, chief engineer at Fairewinds Energy Education, explains what’s involved and walks us through the risks. (Photo: Flickr/Simply Info)