Rare Krypton 81 Isotope Helps Track Water in Ancient Nubian Aquifer

[unable to retrieve full-text content]Krypton 81 allows researchers to reach back a million years to study one of the world?s oldest aquifers.

Source: http://feeds.nytimes.com/click.phdo?i=a33d8307e6773bfe0fe385db6ad7e7c3

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