一场世纪自然灾难竟然引发了日本的核电危机，就让Paula Zahn带我们走入日本去看看在那里发生的这场悲剧，并探讨一下其对美国核电站有何意义。(A comprehensive timeline of the unthinkable natural disaster that triggered a nuclear crisis at Fukushima Daiichi. Paula Zahn takes us inside the dramatic story in Japan, and explores out what it will mean for nuclear power in the United States.)