| CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. | Secret serum likely saved Ebola patients | | Three top secret, experimental vials stored at subzero temperatures were flown into Liberia last week in a last-ditch effort to save the American missionary workers who had contracted Ebola, according to a source familiar with details of the treatment. |
| Spacecraft closes in on comet | | After a 10-year chase taking it billions of miles across the solar system, the Rosetta spacecraft is homing in on its close encounter with a comet. |
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