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And worries linger about cost overruns, which plagued the U.S. industry 30 years ago.
WSJ: Nuclear Energy Pushes On Despite Fukushima
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Despite the intensive screening, ethical questions still linger about fertility for financial gain.
CNN: Dim economy drives women to donate eggs for profit
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So at least for now the influx of Russian wealth in London appears likely to continue, particularly as concerns linger about safety at home.
FORBES: International
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What remains to be seen is whether these cloned embryonic stem cells are more useful therapeutically than the noncontroversial induced pluripotent stem cells, and questions linger about their effectiveness.
CNN: Cloning stem cells: What does it mean?
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It floated only a small portion of its stock, making it more vulnerable to price volatility, but questions linger about Groupon's competitiveness in the crowded market for discounting online.
ECONOMIST: Business this week
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Questions also linger about First Solar's cadmium telluride cells.
FORBES: Storm Clouds
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Suspicions linger in Washington about whether North Korea is proceeding stealthily with its nuclear-weapons program.
CNN: Editorial: Korea's Triumph
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Concerns linger, however, about how the new strict controls on money transfers will affect the Cypriot economy.
WSJ: Early Stock Gains Fizzle
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The bears will tell you that worries about growth in Europe and China still linger and bickering in Washington could still derail the rally.
NPR: The Dow Is At A Record. How Did We Get Here?
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In any case, Watson, excited about the agreement he had signed in Quito, decided to linger in Ecuador.
NEWYORKER: Neptune��s Navy
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"Good retail design is about disrupting the consumer's thinking, getting them to notice you and making them linger for longer, " she says.
BBC: Shopping: The new tactics to get you spending