6 Types of Twins That Are Extremely Rare

Did you know there are more types of twin than just identical or fraternal? There are actually 6 types of twins that are extremely rare, and can teach us a lot more about the science of human development. Join Hank Green for a interesting journey into the world of rare twins. SciShow has a spinoff podcast! It s called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Kevin Bealer, KatieMarie Magnone, D.A. Noe, Charles Southerland, Eric Jensen, Christopher R Boucher, Alex Hackman, Matt Curls, Adam Brainard, Scott Satovsky Jr, Sam Buck, Avi Yashchin, Ron Kakar, Chris Peters, Kevin Carpentier, Patrick D. Ashmore, Piya Shedden, Sam Lutfi, charles george, Greg ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://www.twins.org.au/images/general/publications/Mechanisms_of_twinning.pdf https://www.smithsonianmag.com/science-nature/brief-history-twin-studies-180958281/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5603179/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6509934/ https://link.springer.com/article/10.1007%2Fs00381-004-0985-4 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5134060/ https://www.scientificamerican.com/article/3-human-chimeras-that-already-exist/ https://science.howstuffworks.com/life/genetic/chimerism-be-own-twin.htm https://link.springer.com/article/10.1007%2Fs10815-013-0109-8 https://www.cambridge.org/core/journals/twin-research-and-human-genetics/article/unusual-twinning-resulting-in-chimerism-a-systematic-review-on-monochorionic-dizygotic-twins/22C37BE56B706ED27D34C1DF3AC30D8D https://www.livescience.com/61890-what-is-chimerism-fused-twin.html http://www.ijdb.ehu.es/web/paper.php?doi=10.1387/ijdb.082602hk https://www.theatlantic.com/science/archive/2019/03/these-twins-are-neither-identical-nor-fraternal/584092/