Identical twins are the gold standard in genetics to determine how much of a disease is genetic versus environmental. However, a recent study was published uncovering genetic differences between identical twins. In this week's episode we discuss embryonic development, the study itself, and what this could me with how we determine genetic causes behind diseases.  SOURCES // What are GMOs? GMO Watch podcast episode that we guest starred on: https://gmowatch.com/what-are-gmos-steministas/ Overview article about the study: https://www.mcgill.ca/oss/article/general-science/identical-twins-are-not-identical Overview article about the study: https://www.smithsonianmag.com/smart-news/identical-twins-can-have-slightly-different-dna-180976736/ Actual study: https://www.nature.com/articles/s41588-020-00755-1 Identical twins explanation: https://www.genome.gov/genetics-glossary/identical-twins Identical twins and placenta: https://fetus.ucsf.edu/monochorionic-twins#:~:text=Identical%20twins%20that%20share%20a,called%20monochorionic%20twins%20(MC).&text=While%20fraternal%20twins%20(2%20eggs,up%20sharing%20a%20single%20placenta Heritability: https://medlineplus.gov/genetics/understanding/inheritance/heritability/ Follow us @steministaspod on Twitter and Instagram. You can also email us at [email protected]!