Penny D. Sackett is a physicist, astronomer, and former chief scientist for Australia (2008–11). Sackett has held a research fellowship at the Princeton Institute for Advanced Study and appointments at the Kapteyn Astronomical Institute in the Netherlands and at the Australian National University.

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testing The earth is finite and so are the chemical elements of which it is composed. Those elements, represented by the symbols that fill the boxes of the periodic table, fuel all human consumption. Yet we are mining and redistributing these fundamental elements at such a rapid rate that many are already in short supply […]

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