To some, this may sound unbelievable. But the technology for such chips is no longer the stuff (东西) of science fiction. And it may soon offer many other benefits besides locating(定位) lost children or elderly patients. It could be used as credit cards and people won’t have to carry wallets anymore.

　　On the other hand, some are already wondering what this sort of technology may do to the sense of personal privacy and liberty.

　　“Any technology of this kind could result in improper use of personal privacy,” says Lee Tien, senior staff attorney for the Electronic Frontier Foundation. “If a kid can be tracked, do you want other people to be able to track your kid? It’s a double-edged sword.”

　　Applied Digital Solutions, Inc. in Palm Beach, Florida, says it has recently applied to the Food and Drug Administration for permission to begin testing its device in humans. About the size of a grain of rice, the microchip can be encoded (编码) with bits of information and embedded in humans under a layer (表层)of skin. When scanned by a nearby reader, the embedded chip gives the data.

　　Most embedded chip designs are so-called passive chips, which give information only when scanned by a nearby reader. But active chips---such as the proposed（被提议）Digital Angel of the future---will give out information all the time. And that means designers will have to develop some sort of power source that can provide a continuous source of energy, yet be small enough to be embedded with the chips.

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