Is there such a thing as a quantum leap?
Well, that is a metaphor that is borrowed from quantum mechanics,
and the most remarkable thing about quantum mechanics (which is
the theory of electrons and atoms and other small things) is that
some things come only in special discrete numbers (quanta), and
that atoms (or molecules or other things on that scale) change
by a kind of jump from one quantum number to another.
So, atoms make quantum "leaps" all the time - the answer is yes!
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Update: June 2012