What about something like property crimes/100,000 people and violent crimes/100,000 people? Disease rates are often reported in such ways like in the article posted the best map had rates/100,000 and not strictly population or area.
While I am still a student, I would love to give some feedback. I've found that when using your quiz feature, and you have to type the word or definition, you have to spell it correctly. I have found this as a huge problem when working with foreign languages, because I may not be used to spelling, so it count is wrong. If there is a way to implement some auto correct or spell check with words in the set, I would love that.
