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Twin Day in Argentina

Twin Day in Argentina is held on December 21. This event in the third decade of the month December is annual. Help us Help us 
21 December - Twin Day in Argentina
Every December 21 is celebrated in Argentina the "Day of the Twin" to pay tribute to this particular type of siblings. The ephemeris is not constituted as a commemoration of some historical event, but has to do simply with the symmetry between the 21st and the 12th. The are two people who are born in the same birth and come from the same fertilized egg that was divided in two.
It is estimated that twin pregnancies represent a percentage of two percent of the total pregnancies that occur in the world. There is a difference between siblings who are twins and those who are twins. Twins are born from the division of the same egg fertilized by a single sperm, while twins are born from two different eggs fertilized by two different sperm. For this reason, twins always have the same sex, without exception.

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