Discharging a firearm within city limits tends to be a state by state and then city by city ordinance. I know Tennessee has great news clips from time to time about it.
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Not showing the scale of the rover is inexcusable! Thank you for mentioning it.
Here are some people next to it: http://en.wikipedia.org/wiki/File:Mars_Science_Laboratory_wheels.jpg
Finally got around to posting something today. Such fun.