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- Obama looking at cooling air to fight warming
- U.S. space tourist returns to Earth
- U.S. space tourist, crew return to Earth
- Russia space capsule carrying US billionaire lands
- For chimps, candy is dandy but steak is quicker
- China looks to expand stake in stem cell technology
- Scientists dismiss earthquake prediction
- Scientists to chase tornadoes to learn secrets
- Warming could exceed EU's "dangerous" threshold
- EU: Earth warming faster
- Calif. river system is nation's most endangered
- In double transplant, left hand works first
- Study says warmer ocean water means less oxygen
Low-oxygen zones where sea