Originally published at: https://boingboing.net/2019/03/01/these-children-are-the-second.html
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Yet again biology laughs at our set categories and arbitrary distinctions by being weird, ambiguous and really, really complex.
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I don’t understand this headline.
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“Identical twins” means two siblings born of the same sperm and same egg that split after fertilization. “Fraternal twins” means two people born of two different sets of sperm and eggs fertilized at the same time.
These are “semi-identical twins” because the “two sperm fertilizing the same egg” combo is all but unheard of.
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I understand the twin types.
It’s the wording here: any pair? And there’s no verb — what is it saying?
I think it’s a typo intended to read “An incredibly rare pair”
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Between the headline and the graphic, I immediately understood what the article was about.
YMMV 
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Well now that it dropped “any” it’s the bee’s knees.
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I don’t see what the fuss is about. They’re quite common in anime.
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