The badly damaged Fukushima Dai-ichi nuclear power plant has been upgraded from 5 to 7 on the International Nuclear and Radiological Event Scale. That's, in case you were wondering, out of seven.
The only other nuclear crisis to reach the same level is Chernobyl, and though authorities believe "the cumulative amount [of radiation]from the Fukushima plant is less than that from Chernobyl", another aftershock - 6.6 magnitude - forced workers to evacuate on Monday, and Reactor No. 4 is apparently on fire. [NHK; image via AP]