A long-term view of critical materials: From coal to ytterbium
When Lawrence Berkeley National Laboratory (Berkeley Lab) scientist Frances Houle considers the national alarm that has sounded over the shortage of rare earth materials—critical ingredients in a wide range of clean-energy and medical technologies—she tends not to panic.
http://www.rdmag.com/News/2012/08/Materials-A-Long-Term-View-Of-Critical-Materials/
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