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Twins can be a lot more complicated than just identical or fraternal, and the rarer types of twins suggest that we have a lot more to learn about human development.

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Sources:

https://www.twins.org.au/images/gener…
https://www.smithsonianmag.com/scienc…
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://link.springer.com/article/10….
https://www.ncbi.nlm.nih.gov/pmc/arti…
https://www.scientificamerican.com/ar…
https://science.howstuffworks.com/lif…
https://link.springer.com/article/10….
https://www.cambridge.org/core/journa…
https://www.livescience.com/61890-wha…
http://www.ijdb.ehu.es/web/paper.php?…
https://www.theatlantic.com/science/a…