Has the extra info on quiz answers always been available or was it added at a later date? I don't like to penalize someone in the rating of their quiz when extra info in not there if it wasn't available. If it was added later it would be nice so see some kind of indication on older quizes.

I'm pretty sure that interesting info has always been available, but over the years, quiz-writing standards have risen, and it's now required that info is included whether it be a one or two sentence minimum.

The interesting information box (aka explanation of the answer) has been in the quiz template since day dot, back in Feb 00. It was an optional field at that time. It became mandatory in Feb 04.

[ the quiz template still has the original wording above the input box: Highly recommended ]