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John: we learned more about the amazing 3d printer. this new gun is featured in "reason" magazine. lots of people worry about risks of things like printable guns. everyone is thrilled about printers making new body parts. i talked to dr. kevin campbell about printed skin and kidneys. printing organs? >> exactly. it is amazing technology. it uses the same technology as a ink jet printer but instead of ink we have a matrix of stem cells and other organic compound. and the computer generates this three dimensional image that is a living organ. this could solve so many problems in medicine with or...

John: we learned more about the amazing 3d printer. this new gun is featured in "reason" magazine. lots of people worry about risks of things like printable guns. everyone is thrilled about printers making new body parts. i talked to dr. kevin campbell about printed skin and kidneys. printing organs? >> exactly. it is amazing technology. it uses the same technology as a ink jet printer but instead of ink we have a matrix of stem cells and other organic compound. and the computer generates this three dimensional image that is a living organ. this could solve so many problems in medicine with or...

Printer, how they can make a gun or other nonliving things, but the next thing is replacing organs. printing organs. >> it is the same technology instead of an ink-jet printer. there are other organic compounds and a computer generate the three-dimensional image. this has been accomplished already in children woborn witht a windpipe. three dim me thinknal tracheas implanted in these children. these children are doing as well now. we will be able to serve patients who normally may die waiting on a transplant list. >> which is about 18 people today most waiting for kidneys.

Applications. for example, it can be used to make electrodes in solar cells. so to make efficient, cheap, solar cells. once you have the graphene as we make it in the blender, it is in a liquid form and print it out of ink jet printer to make ink jet printed batteries or conductors. jenna: wow. >> there are lot of different applications. i'm working on a project where we're using it to improve beer bottles. jon: yes. jenna: you have jean's attention. he wasn't pay too much attention with solar cells and automotive stuff. beer bottles, so you for what though? i can't let you go without, for the...

A child have a windpipe 3d printed and the children are doing well. we can do it with hearts and kidneys and other organs. i think we're probably five to 10 years down the line. jenna: how does it work? >> it works like a ink jet printer. instead of ink, you infuse the printer with stem cells and cells harvested from biopsies with a matrix. the computer programs tell it how to print the three dimensional organ. it is very complex and difficult to do but it works. jenna: tell us how difficult it is to do a heart implant from somebody else. if someone needs a new heart and hard to get that and g...