A story from my life about not judging a book by its cover...and Algorithm D:
Some years after the turn of the millennium I was a CS student at UC Santa Cruz. I was taking various classes for my major and I ended up in a Comparative Programming Languages class, which was a quarter-long survey of different modalities - I remember Haskell, OCaml, C++, and there were maybe two others.
Anyway I had started noticing a particular student showing up in some of my classes. He stood out. Firstly because he was always asking questions, sometimes to the point of annoying other students. And then because he was older than the rest of us - in hindsight he probably wasn't older than his early 40s - but I was ~20 and as I came to learn, he'd lived hard. He had a stout, platinum blonde beard that seemed yellowed from the hand-rolled cigarettes I always saw him smoking outside the computer lab.
After class one day I started chatting with him. I wasn't much of a question-asker, and I found his willingness to do so in the face of obvious annoyance to actually be kind of brave, so I think I probably opened by complimenting him and asking if the reactions from other students bothered him. His answer, gravely-voiced, was clear: he was paying for these classes same as anyone else, and he wanted to get his money's worth. I found it a refreshingly self-centered take. I decided I liked the guy.
Over time we became lab-mates, working on projects together. He always reeked of tobacco; his fingers too were yellowed from those rollies. I learned that he'd never finished college his first time around, instead getting hired into industry and riding the wave of the dot-com boom. When the crash eventually landed, he washed out and found himself living the surf bum life in Mexico, soaked in alcohol and seawater. When he eventually decided he had to get his life together, he sobered up and moved back to the States. But he was unemployed, homeless - living out of his VW van - and a 40-something college student. He was a misfit.
So, let's see..right, Algorithm D. So for our Comparative Languages class, the OCaml project was an arbitrary-precision calculator. We worked through addition, subtraction, and multiplication, and then as the project deadline approached we turned our sights towards division. Me, I took one look at Knuth and decided to start instead with a brute-force implementation. But once that worked, we began tackling Algorithm D. Around 2am, still not done, I threw up my hands and said I was going home - I'd take whatever grade was coming. My partner also went home - to his van parked in the Engineering lot. I knew he didn't own his own computer, so imagine my surprise when I saw him the next day and he told me he had finished the Algorithm D implementation overnight.
Turned out he had gone back to his van that night with a pen and a ream of paper and worked the code out by hand, only typing it up in the morning. We were lab partners but I wasn't going to copy something I'd had no hand in; I got whatever grade I deserved and he got the perfect score. I'm sure the older heads have plenty of stories of coding by hand, but even by that time, circa 2005, such a thing seemed arcane, almost unheard of. I was duly impressed.
I occasionally wonder what happened to him - he was a smart guy and a good engineer, and I learned some important lessons from him. I hope he found his footing. And for the sake of his cubicle mates, maybe also kicked the cigarette habit.