Two issues with the quizzes:

1. general issue: on one question I accidentally clicked "Next" before choosing an answer, I got 0 on that question, it would be nice if it stayed on that question and an answer was mandatory.

2. I did the compression quiz, and after the second or third question it said "resuming quiz in progress" at the top of the page and repeated the previous question. When I got my score, I got 9 out of 10 and the question I got "wrong" was a question I had never seen. I guess it showed me the previous question, but applied the answer to a different question that wasn't displayed. Just wanted to let you know in case it's a recurring issue.

Also if this quiz could be deleted from my record so I could redo it, that would be great.