I had an amazing realization a couple days ago. But before I tell you about it, let me set the Fertility 101 stage, as it were: A baby girl emerges from her mother’s womb with all the eggs she will ever have, already residing in her tiny ovaries. Baby boys, on the other hand, don’t start producing sperm (the analog to the female egg) inside their testes until they reach puberty, about 12 years later. So what does this have to do with every human walking this earth? The answer will probably challenge every notion you’ve ever had about where we all came from. In reality, every single one of us actually started out inside our maternal grandmother. In other [...]