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A young woman in her teens has about 300,000 eggs in her ovaries. By the time she is menopausal, none are left.

Every batch of sperm represents an opportunity for genetic typos - called de novo mutations - to be passed on. A 20-year-old man and woman will each pass on about 20 de novo mutations to a baby they conceive. By the time the couple is 40, a woman's total has remained at 20, while a man's has jumped to 65 - and it keeps climbing from there.

Women right now kind of have this idea of success - putting your career first and then having kids. On one side, it's perfect and it's a great plan, but on the other side, they don't explain to you that after age 35, you start losing eggs.

It seems like, to me, somewhere between 30 and 35 is a really, really good time to turn your eggs into babies.

I don't think a lot of women know how much their chances of having a child diminish as they age.

Women have to control their fertility for 30 years. Thirty years is a long time not to make mistakes.

Every year, more than 1 million children are left motherless and vulnerable because of maternal deaths, and children who have lost their mothers are up to 10 times more likely to die prematurely than those who have not.

One-third of all female infertility is the result of blocked fallopian tubes. If fertilization could be done in the lab and then the fertilized egg implanted in the womb, it would get around that problem. Millions of women who cannot have children would suddenly be able to.

Beyond 2050 the world population may start to decrease if women across the world will have, on average, less than 2 children. But that decrease will be slow.