Scientists have developed a ‘GPS’ system that can track inside the human body

Tumour: New wireless, 'in-body GPS' system can track tumours - The Economic  Times

If you want to find a restaurant, Google Maps does a pretty good job.  Using the Global Positioning System satellites in orbit around the Earth, Google can pinpoint the restaurant’s location, tell you how far away from the restaurant you are and how long it will take you to get there. Now apply that philosophy to the human body. In diseases such as cancer, you might want to find a tumor — but you can’t use a GPS to do that. Until now. Researchers at MIT’s Computer Science and Artificial…

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