One of the world's top physicians, Dr. Eric Topol, has a prescription that could improve your family's health and make medical care cheaper - the smartphone. Topol has long been one of the world's foremost cardiologists. He has now become the foremost expert in the exploding field of wireless medicine, and this explosion, he says, is about to make our health care better and cheaper. He shows how simply his modified iphone produces a cardiogram for a patient. The device was approved by the FDA in December and is now sold to physicians for $199. Topol tells his patient he just saved a $100 technician's fee. [Topol:] These days i'm actually prescribing a lot more apps than I am medications. You can take the phone and make it a lab on a chip -- you can do blood tests, saliva tests, urine tests, all kinds of things. Actually I think it helps make the whole interaction much more intimate, because now I'm sharing the results in realtime. There's so much technology now that we could - by using digital [infra]structure that exists today -- make the office visit an enjoyable thing. [Topol] had a reputation for brashness. He questioned the safety of the hugely profitable pain killer Vioxx and eventually forced it off the market.