Ever heard of "heteropaternal superfecundation"? It's an extremely rare phenomenon by which fraternal twins can be fathered by two different men. The term made headlines back in 2015 when a New Jersey ...
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Do identical twins have the same DNA?
It makes sense that identical twins would have the exact same DNA, right? Spoiler alert: Not always! Here's why. Identical twins (also called monozygotic or MZ twins) are conceived when a single sperm ...
Twins have been rare in human history and for that reason can seem special. Many cultures associate twins with health and vitality, while others see them as a philosophical reminder of the duality of ...
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