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The sharpest object made by humans

Ever wonder what the sharpest human-made object looks like under a super-high-powered microscope? Well, no, we'd never thought about it either, until we came across this post titled "Sharpest Manmade Thing." Physics News Graphics, published by the American Institute of Physics, has posted a photograph taken with a field ion microscope that shows a "very sharp" tungsten needle, right down to individual atoms.