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The United Nations' top nuclear official says the situation at Japan's troubled nuclear power plant continues to be very serious as Japanese authorities struggle to bring the situation under control. The U.N.'s nuclear energy body - the International Atomic Energy Agency - says radiation levels in a village outside Japan's nuclear evacuation zone are twice the levels believed safe for habitation.

ORIGIN: the exact origin of April Fool's Day isn't known, but many think it began in France around 1582 with the introduction of the Gregorian Calendar, which is the most widely used calendar today. In previous calendars, New Year's Day was between March 25 and April 1. Many people refused to change the New Year's celebration day and were dubbed "fools." They were sent on "fool errands," sent invitations to nonexistent parties and had other practical jokes played on them.
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