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Only keeping the latest kernel is a Very Bad Idea. As is mentioned in other comments, Fedora keeps the three most recent kernels by default so that if anything goes wrong with the newest one, you have two backup kernels to use. Why? Well, when I updated to the 3.11 kernel, there was a problem with the video drivers and I couldn't boot into a GUI. I was, however, able to reboot, select the kernel I was using before the update and get everything working long enough to learn what the problem was and fix it. Without that backup kernel, I'd have been in Very Big Trouble.