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University of Minnesota

In a small-scale demonstration at the University of Minnesota laboratory, the researchers showed how their new material can generate electricity when the temperature rises slightly. Pictured, from left, are Professor Richard D. James, doctoral student Yintao Song and postdoctoral students Bhatti Kanwal and Vijay Srivastava

Conversion of heat from waste to electricity

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A gold coin minted by Ptolemy V and discovered in the north of the country in 2010 depicts a queen - possibly Arsinoe II, who married her brother Ptolemy II. Photo: Antiquities Authority

A very rare gold coin about 2200 years old was discovered in excavations in the north

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