Tvilling: Forskelle mellem versioner

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* [http://www.forlaget-tekstxpressen.dk/uge-for-uge-kalender/ Uge-for-uge-kalender – om tvillingegraviditeten]

* [http://www.world-science.net/othernews/050617_jumpgenefrm.htm June 17, 2005, World Science: Random “jumping genes” give our brains uniqueness, researchers find] Citat: "...this may explain the longstanding puzzle of why no two brains look the same, not even those of otherwise identical twins..."

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