Challenge questions

Not for grades!

These are not essential for learning the material and can be skipped without affecting your grade. See syllabus for more information. I will not post solutions for the challenge questions.

Find a new error (not just typo) on the course material, and file an issue on the github Issues page. Make sure to look first in the closed issues page since only previously unreported errors will be considered.

Issues for typos are welcome too, but will not count towards this challenge.