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# The Book — A Complete Working Document --- ## The Premise On the day a child is born, the world divides into two identical copies. In one world the child is male. In the other, female. Everything else — the genome, the city, the parents, the quality of the light coming through the hospital win…

# The Book — A Complete Working Document --- ## The Premise On the day a child is born, the world divides into two identical copies. In one world the child is male. In the other, female. Everything else — the genome, the city, the parents, the quality of the light coming through the hospital window — is identical. The only variable is the chromosome. This is what that difference made. --- ## The Central Argument The book is not about gender as ideology or politics. It's about something m