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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:   / 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:   / scishow   Twitter:   / scishow   Tumblr:   / scishow   Instagram:   / thescishow   ---------- 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...