"Watch Dean Kamen and Joanne Colan investigate some of the most exciting and cutting edge technology being developed. Prosthetics that allow disabled people to become hyper-abled, robots that kill cancer cells, plants that can turn waste into power and computers that can read minds are only some of the amazing projects seen on Dean of Invention." -- iTunes Store
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A new age of medicine is upon us, an era of tiny robots with enormous power, including "nanobots" that are able to enter the bloodstream, find cancerous cells without anyone's guidance and kill them.
the fine print: Downloads posted on the Free iTunes Downloads blog are usually free for ~1 week. After that, you'll have to pay for them.