Fraternal twins are there--but you may not see them.
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Twofold 
The Singular World of Twins and Twin Studies.
By Dr. Nancy L. Segal
How do we explain great athletic skill? 
Relationships
Why Identical Twins Fascinate Us – and the Case for Fraternals
Identical twins are intriguing, but most people cannot tell you why this is so. I think I have an answer . . .
Recent Posts in Twofold
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