This is the first episode of a three part series on pregnancy and parenting. Bird Pinkerton: Pregnancy is mysterious in ways that are amazing or inspiring, but also in ways that can hurt parents or at least confuse them. "Unexplained" will look at mysteries about pregnancy from the parents perspective.
Fetuses leave cells behind in their parents' bodies, where they braid themselves into tissues, and remain, for years. What are they doing in there?
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