What is the difference between incidents and incidences?
I heard a story on news radio last night about a number of armed robberies and the reporter kept using the word "incidences" referring to the individual robberies, when I thought she should have used "incidents".
And I always have to think before I write then/than. Usually in the context of if/then: "If I go to Target, then I can pick up my dry cleaning on the way home." vs "I'd rather go to Target than the dry cleaner first".