This is an I-Heart podcast.

Guaranteed Human.

It's that time.

Lock and load.

The Michael Vary Show is on the air.

Hi. is on the air. Professor Mark Defant is our guest, Professor.

I interrupted you in the middle,

so if you just kind of pick up, rewind,

like they do on the American Greed or any of the other specials,

kind of catch us up to where we were.

Keith Morrison's great at this,

and then continue to launch in because this is fascinating.

Okay, well, give me a heads up if I'm running down the wrong track here.

I was talking about how our large brains have forced women to have babies early before the brain is

fully developed.

And as a consequence, we have the birth of pretty helpless animals.

You know, it's very different in much of the animal kidney

because when a baby giraffe is born, boy, they're pretty much up and running

within the first few hours of life, whereas it takes years for humans to reach full development.

And then there's another thing going on here, which Darwin knew about when he was studying evolution, and that is that it's not all about natural selection a natural selection being

that the fittest survive in the animal kingdom but he also noticed that there was a sexual selection

going on where for example with some species like gorillas and lions big males fight with other big males, and the winner takes

...