Fedora 21 is a 'Null'
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Typically, the Fedora project has had two releases in any given year: one in the early spring, the other early winter. For 2014, that likely won't be the case.
Fedora 20 was released on Dec. 17, 2013, and its successor won't debut until August 2014.
Another key change in the Fedora Linux world is the naming strategy for new releases. The Fedora project has chosen some interesting names for its Linux distribution releases in recent years. The Fedora 20 release was named Heisenbug, Fedora 19 was called Schrodinger's Cat, Fedora 18 was the Spherical Cow, and Fedora 17 was the Beefy Miracle.