I had a really good friend years ago, like 2005, who lost an entire assignment he wrote in Visual Basic for calculating heat rising in a soda can. It was on his work computer and he deleted it by accident. It was his senior project and last thing he had to turn in before graduation. He showed me what he needed and I was like, "That's easy. I think I can write that."

He still had all the equations. I built the simulator in Java (I had just graduated and had all the time; looking for my first job). I got to teach him some stuff about programming, and he taught me stuff about Thermo/Engineering. I still have that code; moved it from CVS to Git. 13 years ago ... wow:

https://github.com/sumdog/...