Yes, Duke is friendly toward additional info, and I think your story is relevant. I would send them a SHORT letter (just two paragraphs or so), doing two things: 1) reaffirming your strong interest in the program, and 2) giving them a very brief update on thisnew achievement. Re: the achievement, keep it brief, but also be sure to make sure that it doesn't come across as too abstract or esoteric. Help the adcomms see why this is a big deal.
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