Too much radiation can raise the risk of developing cancer years down the road,
scientists agree. But just how
much or how long an exposure is risky is not clear. Those are among the unknowns scientists are contemplating as the crisis unfolds at Japan's stricken nuclear power plant.
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A fire burning deep inside the Soudan
Underground Mine State Park in northern Minnesota on Friday
threatened a $50-million physics laboratory operated by the
University of Minnesota, and a site that allows visitors to travel
more than 2,300 feet into the earth.
Investigators worked overnight to reach the ruptured gas line in south Minneapolis that became the scene of a major natural-gas fueled fire on Thursday.
The Minnesota Pollution Control Agency is
urging residents and businesses to prepare fuel oil, gasoline and
petroleum tanks for possible flooding in the next few weeks.
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U.S. aviation regulators and airline meteorologists are monitoring the radiation plume drifting northeast from Japan's damaged nuclear reactors to ensure it doesn't threaten commercial jet routes.
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