Wikipedia picture of the day on November 23, 2017: A high purity (99.999 %) rhenium single crystal made by the floating zone process, an ebeam remelted (99.995 %) rhenium bar and as well as a high purity (99.99 % = 4N) 1 cm3 rhenium cube for comparison. https://commons.wikimedia.org/wiki/File:Rhenium_single_crystal_bar_and_1cm3_cube.jpg
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