Link to the Show / Show NotesChallenges in Japan continue as the country faces an ongoing nuclear disaster. Robots may soon be sent in to provide video feeds and radiation detection from areas of the plant where people still can't go. Also: Tokyo will likely continue to face rolling blackouts for some time; NPR science Correspondent Christopher Joyce explores why many Japanese aren't connecting this nuclear disaster with the atomic bombs of World War II; and Joe Palca reports on a new study that finds humans may have come to the Americas 2,000 years earlier than previously thought.

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