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I'm John Batcher, sitting with Mary Roach, the author. Her new book is Replaceable You.

Adventures in Human Anatomy. Different parts of the body, externally and internally, can be replaced. and it's been going on for centuries

and dating back to the romans the greeks however modern times requires us to attend to

something i didn't know what's going on to print an organ now this is literal correct mary

they really are ambitions to print a heart.

How does it work?

There are ambitions, yes, but I would say it's in the early phases.

For example, a heart, a heart is a muscular organ.

It's a muscle for the most part.

And to print muscle, you would think, well, it's one kind of cell.

It should be pretty simple.

You load the material and the printer lays down the cells.

But in fact, you need to consider how are those individual muscle

...