The tips used in electron microscopes for shuffling atoms around individually, they are single-atom-wide tips. It's physically impossible to be any sharper as far as I'm aware as that would require you to have a tip that was less than an atom wide.
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whats in is that the world did not end
certainly. Probably one of the sharpest scientist mankind ever knew.
candy floss
whats 40 meters below sea level
Matter