TIL that a third type of twins exist: "Semi-identical" - When a single egg is fertilized by two sperm and then splits.


TIL that a third type of twins exist: "Semi-identical" - When a single egg is fertilized by two sperm and then splits. http://www.bbc.com/news/health-47371431 cydril August 30, 2022 at 11:58PM

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