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In utero, a foetus is developing limbsn and eyes, but also a bunch of eggs. The baby is born with maybe around one to two million ovaries. A few of them are disappearing even as the baby becomes a child. In puberty, there's kind of a cohort of these sleeping tiny egg setter recruited. These recruits then start growing, and at one point one ag is head of the pack and starts helping inhibit the other eggs, which all die.

There's an old story scientists tell about human ovaries: that they are ticking clocks that only lose eggs, never gain them. Now that story might be changing, opening the door to new treatments for infertility and menopause.

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