I dreamt that a revolutionary gadget for medical check-ups just came on the market. It cost very little and it was so easy and safe to use that it could be found in every supermarket. I remember holding a small package with the check-up gadget in my hands. It looked like a stubby ballpoint pen. All one needed to do was remove a protective cap from one end, press it against a vein visible on the skin, and press a button on the other end. A short needle, which would cause only momentary sting and no bleeding, would deliver into the blood stream a microscopic thingy equipped with a collection of sensors and a radio emitter. By the next day, any hospital would be able to read all sorts of useful things from it without pulling it out or even locating it precisely. Even more amazing, the sensors and the emitter would keep working for a couple of years. One could have several medical check-ups without a new package, which was especially valuable to chronic patients. The first thought that came to me upon waking was that it was a great pity the dream did not come to a medical doctor who would get from it much more than I ever could.