TIL of Heteropaternal Superfecundation – When twins are conceived with sperm from two different men. One way this can occur is when the sperm survives for a few days inside the female reproductive tract.

Read more: https://www.theguardian.com/lifeandstyle/shortcuts/2018/dec/11/one-set-twins-two-fathers-how-common-is-superfecundation

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