TIL that there are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation. : r/todayilearned
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:max_bytes(150000):strip_icc()/twin-babies-one-crying-56a689fa5f9b58b7d0e37049.jpg "What Are Polar Body Twins?")