I made Mike's Ice in 11th grade.
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We wrote a bunch of Matlab codes relevant to heat transfer and fluid mechanics that modeled a water jet drill moving through a glacier. None of the code worked, but that's because I found out one of my partners stole his code, and we found that out the day before it was due. I'm proud of it because we did the right thing (removed the stolen code, reported the incident, and turned in what we had versus turning in the whole thing and praying they wouldn't notice).