Becca Bressler

But before we do...

So about 40 years ago, Harvey's just gotten out of medical school.

So about 40 years ago, Harvey's just gotten out of medical school.

So about 40 years ago, Harvey's just gotten out of medical school.

Studying ovaries.

Studying ovaries.

Studying ovaries.

And these other scientists in the lab ended up with this thing called a gradient, where the different kinds of cells in the placenta were sort of separated out. They can look at them independently.

And these other scientists in the lab ended up with this thing called a gradient, where the different kinds of cells in the placenta were sort of separated out. They can look at them independently.

And these other scientists in the lab ended up with this thing called a gradient, where the different kinds of cells in the placenta were sort of separated out. They can look at them independently.

He saw these cells, sort of a bubbling cauldron of cells.

He saw these cells, sort of a bubbling cauldron of cells.

He saw these cells, sort of a bubbling cauldron of cells.

Later, he'd make movies of them.

Later, he'd make movies of them.

Later, he'd make movies of them.

They were growing very aggressively in a way that surprised him.

They were growing very aggressively in a way that surprised him.

They were growing very aggressively in a way that surprised him.

And that's the story we're going to tell you.