The Top 10 Science Stories of 2011: Scientific American: "Inevitably, year-end lists invite plenty of debate and criticism, and Scientific American's is no exception. Certainly, we could have included the discovery of new worlds beyond our solar system, including Kepler 22 b, an exoplanet in the "Goldilocks" zone of habitability, as well as the first known Earth-size exoplanets. Or noted the accumulating evidence suggesting that hydraulic fracturing, or fracking, to retrieve natural gas is likely to contaminate water supplies. "
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