I think everyone is familiar with centerfire ammunition- i.e., a cartridge that, when struck in the center of its rear, ignites propellant and drives the bullet forwards.
Interestingly, there is another (very popular) means of igniting the propellant called rimfire:
http://en.wikipedia.org/wiki/Rimfire_ammunition
It relies on compressing the side of a "rim" in the rear of the bullet to cause ignition.
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