I think you may already have this figured out, but `capitalize!` is different from `capitalize`. The difference is that the one with the bang `!`, actually overwrites `first_name` so that it is capitalized. The one without the bang just shows you what the variable would look like without actually overwriting it.

Just keep in mind that you're overwriting data with a method that uses the `!` convention. As long as you're aware of it, it's safe.