A hedge-fund manager and a Harvard biologist are betting that stem cell–derived eggs will transform how humans reproduce.
When a baby girl is the size of a sweet potato—about 10 inches from head to toe in her mother’s womb—she has the most eggs she will ever have in her entire life.
By the time she’s born, those 6 to 7 million eggs will have dropped to about 1 or 2 mill... [468 chars]