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This is CBS Eye on the World. Here's John Batchelor.

This is CBS, I on the World. I'm John Batchelor. It is a beautiful day. Diana and her husband are trimming the shrubbery. There is left over, so Diana takes it to a burn unit where you can put it in and set the fire and get rid of the ashes. She can't light it because the shrubbery is green. Her husband goes and gets a gas can from the garage. That is the moment that Diana reflects upon all these years later. I welcome

Mary Roach, the author of the new book, Replacable You, Adventures in Human Anatomy.

I've known Burned Patience, and it's a miracle what happens afterwards,

but Mary's up to date on the skills of the reconstruction of skin,

which is an organ, our biggest organ, our most sensitive organ, and boy, you need it.

Mary, a very good evening to you. I told the horrible part of the story. You get to tell

the heroic part of the story. Diana suffers third-degree burns on most of her body.

First, a distinction between second-degree and third-degree. What does that mean, Mary?

Good evening to you.

Good evening, John.

Thank you for having me on.

The difference is an important one because with a second degree burn, the body regenerates skin from below.

...