That said, I find the idea of a t-shirt to commemorate a single course (whatever it's difficulty) amusingly odd.
As for the t-shirt, CS50 has one of the largest enrollments and Malan puts a lot of effort into making it fun, engaging, encouraging, and fostering a sense of community. Out of such a large enrollment at a liberal arts college, of course many will not take other CS course, but the course has definitely contributed to an increase in the number of students declaring CS as their major (what Harvard calls a "concentration").
Okay, not being familiar with 'a quarter system' myself anyway, I only said 11 weeks based on the 11-week schedule in the blog post.
https://en.wikipedia.org/wiki/Math_55
> From 2007 onwards, the scope of the course was changed to more strictly cover the content of four existing semester-long courses in two semesters: Math 25a (linear algebra) and Math 122 (group theory) in Math 55a; and Math 25b (calculus, real analysis) and Math 113 (complex analysis) in Math 55b. The name was changed to "Honors Abstract Algebra" and "Honors Real and Complex Analysis" to reflect this.[citation needed]
Linear algebra, abstract algebra, calculus, and real and complex analysis in one course. Sounds like fun.
especially since i'm right across the river from them.