Peter Attia, M.D.

And so you have a female brain that is developing in the absence of testosterone.

The XX brain is developing in the absence of testosterone.

The XY brain is developing in the presence of high amounts of testosterone.

Testosterone then falls.

By the time these two babies are born, they both have really low testosterone.

Then it sounds like you're saying, unbeknownst to me until a few minutes ago, you have this little mini puberty that comes three months later.

How high does testosterone get there and

Once you cross this threshold.

I think the main thing I'm hearing you say, Carol, is that...

When you observe five-year-old boys and five-year-old girls behaving completely differently, the most obvious explanation for the why is a behavioral difference.

And the behavioral difference is driven by potentially the way their brains developed during that critical window of being bathed in testosterone, as opposed to the differences in testosterone in a five-year-old boy versus a five-year-old girl, which are de minimis.

Define that again, because I want to make sure the listener understands when you're referring to gamete, what you're talking about and the production of them.

I know you weren't consulted during the design phase, but do you have a sense of why the female gametes are all produced up front?

Oh God.

And you basically get your lot at birth and then you, that's it.

It's a rate of attrition versus why the male gamete is just produced on demand.

Again, I'm being a bit facetious.

Of course, we don't know this, but do you have an insight into why that's the case?

I know.

I just talked about this with Paula.