A gynecologist points to the head of a fetus in an ultrasound image. | Jan Woitas/picture alliance via Getty Images We live in an era of endless optimization. Fitness trackers help us measure our lifespan, people are consuming piles of protein in an attempt to be their best selves, and there’s even an urge to maximize our morality. In a world of constant self-improvement, it’s no wonder that journey has reached our attempts at reproduction.  Kristen V. Brown is a journalist and author of the forthcoming book The Immortal Womb: The Centuries-Long Quest to Control the Female Body and...