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The theory of hair-volution
The theory of hair-volution
By Elizabeth Snead, The Envelope

Sandy Duncan and David Cassidy show off early versions of today's super-hot cuts. You can actually see the evolution of the Cruise Crop and the Efron Fringe from these dos worn at the Emmy Awards in the early '70s, otherwise known as The Decade That Taste Forgot.
(WireImage)
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