Content[ edit ] "Why Don't You Dance? The reader gets the feeling that he may be selling all his possessions, looking to start life anew. A young couple stops by to select furniture for their new apartment.
An excellent technical introduction to nanotechnology is Nanosystems: Eric Drexler, Wiley The Feynman Lectures on Physics are available online. I imagine experimental physicists must often look with envy at men like Kamerlingh Onnes, who discovered a field like low temperature, which seems to be bottomless and in which one can go down and down.
Such a man is then a leader and has some temporary monopoly in a scientific adventure.
Percy Bridgman, in designing a way to obtain higher pressures, opened up another new field and was able to move into it and to lead us all along. The development of ever higher vacuum was a continuing development of the same kind.
I would like to describe a field, in which little has been done, but in which an enormous amount can be done in principle. This field is not quite the same as the others in that it will not tell us much of fundamental physics in the sense of, "What are the strange particles?
Furthermore, a point that is most important is that it would have an enormous number of technical applications. What I want to talk about is the problem of manipulating and controlling things on a small scale.
As soon as I mention this, people tell me about miniaturization, and how far it has progressed today. They tell me about electric motors that are the size What we talk when we talk the nail on your small finger.
It is a staggeringly small world that is below. In the yearwhen they look back at this age, they will wonder why it was not until the year that anybody began seriously to move in this direction. Why cannot we write the entire 24 volumes of the Encyclopaedia Brittanica on the head of a pin?
The head of a pin is a sixteenth of an inch across. If you magnify it by 25, diameters, the area of the head of the pin is then equal to the area of all the pages of the Encyclopaedia Brittanica.
Therefore, all it is necessary to do is to reduce in size all the writing in the Encyclopaedia by 25, times. In other words, one of those dots still would contain in its area 1, atoms.
So, each dot can easily be adjusted in size as required by the photoengraving, and there is no question that there is enough room on the head of a pin to put all of the Encyclopaedia Brittanica. Furthermore, it can be read if it is so written.
How would we read it? If we had something written in such a way, we could read it using techniques in common use today. They will undoubtedly find a better way when we do actually have it written, but to make my point conservatively I shall just take techniques we know today.
We would press the metal into a plastic material and make a mold of it, then peel the plastic off very carefully, evaporate silica into the plastic to get a very thin film, then shadow it by evaporating gold at an angle against the silica so that all the little letters will appear clearly, dissolve the plastic away from the silica film, and then look through it with an electron microscope!
There is no question that if the thing were reduced by 25, times in the form of raised letters on the pin, it would be easy for us to read it today. Furthermore, there is no question that we would find it easy to make copies of the master; we would just need to press the same metal plate again into plastic and we would have another copy.
How do we write small? The next question is: How do we write it? We have no standard technique to do this now. But let me argue that it is not as difficult as it first appears to be. We can reverse the lenses of the electron microscope in order to demagnify as well as magnify.
A source of ions, sent through the microscope lenses in reverse, could be focused to a very small spot. We could write with that spot like we write in a TV cathode ray oscilloscope, by going across in lines, and having an adjustment which determines the amount of material which is going to be deposited as we scan in lines.
This method might be very slow because of space charge limitations. There will be more rapid methods. We could first make, perhaps by some photo process, a screen which has holes in it in the form of the letters.
Then we would strike an arc behind the holes and draw metallic ions through the holes; then we could again use our system of lenses and make a small image in the form of ions, which would deposit the metal on the pin. A simpler way might be this though I am not sure it would work: We take light and, through an optical microscope running backwards, we focus it onto a very small photoelectric screen.
Then electrons come away from the screen where the light is shining. These electrons are focused down in size by the electron microscope lenses to impinge directly upon the surface of the metal.Welcome to Albuquerque New, Mexico, and the home of heart doctor Mel McGinnis and his wife Terri.
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Jun 18, · "What We Talk About When We Talk About Love" is not only the most well-known short story title of the latter part of the 20th century; it has come to stand for an entire aesthetic, the bare-bones prose style for which Raymond Carver became famous/5().
Tony Robbins discusses the "invisible forces" that motivate everyone's actions -- and high-fives Al Gore in the front row.
In order to do this, we must change what we talk about when we talk about health. Sandro Galea, MD, DrPH, is Professor and Dean at the Boston University School of Public Health.
His latest book Well: What we need to talk about when we talk about health, will be published in May