Happy those who do not follow the counsel of the wicked, Nor go the way of sinners, nor sit in company with scoffers.Rather, the law of the LORD is their joy; God's law they study day and night.They are like a tree planted near streams of water, that yields its fruit in season; Its leaves never wither; whatever they do prospers.But not the wicked! They are like chaff driven by the wind.Therefore the wicked will not survive judgment, nor will sinners in the assembly of the just.The LORD watches over the way of the just, but the way of the wicked leads to ruin.
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?'') but it is more like solid-state physics in the sense that it might tell us much of great interest about the strange phenomena that occur in complex situations. 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 of the nail on your small finger. And there is a device on the market, they tell me, by which you can write the Lord's Prayer on the head of a pin. But that's nothing; that's the most primitive, halting step in the direction I intend to discuss. It is a staggeringly small world that is below. In the year 2000, when they look back at this age, they will wonder why it was not until the year 1960 that anybody began seriously to move in this direction.
Why cannot we write the entire 24 volumes of the Encyclopedia Brittanica on the head of a pin?
Let's see what would be involved. The head of a pin is a sixteenth of an inch across. If you magnify it by 25,000 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 25,000 times. Is that possible? The resolving power of the eye is about 1/120 of an inch---that is roughly the diameter of one of the little dots on the fine half-tone reproductions in the Encyclopaedia. This, when you demagnify it by 25,000 times, is still 80 angstroms in diameter---32 atoms across, in an ordinary metal. In other words, one of those dots still would contain in its area 1,000 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.
Elaboration -- going into detail about the parts
A definition is a passage that explains the meaning of a term (a word, phrase or other set of symbols), or a type of thing.
The term to be defined is the definiendum (plural definienda). A term may have many different senses or meanings. For each such specific sense, a definiens (plural definientia) is a cluster of words that defines it.Method
A chief difficulty in managing definition is the need to use other terms that are already understood or whose definitions are easily obtainable. The use of the term in a simple example may suffice.
By contrast, a dictionary definition has additional details, typically including an etymology showing snapshots of the earlier meanings and the parent language.
Like other words, the term definition has subtly different meanings in different contexts. A definition may be descriptive of the general use meaning, or stipulative of the speaker's immediate intentional meaning.
For example, in formal languages like mathematics, a 'stipulative' definition guides a specific discussion. A descriptive definition can be shown to be "right" or "wrong" by comparison to general usage, but a stipulative definition can only be disproved by showing a logical contradiction [3].
(given by the numbers in the text, like the [3] above)
An analogy is a comparison between two different things so you can point out something about how they are similar. The comparison often is done point by point.Metaphors and similes, which we talked about in the lesson on figurative language, are kinds of analogy. Here are more examples.
It often is done to explain something not well known by describing something that is known so you can generalize the information from what you already understand to the new thing.
Its a way to provide insight by suggesting existing similarities suggest that there are even more points that are similar.
Your business is to fix his attention on the stream. Teach him to call it "real life" and don't let him ask what he means by "real".
Remember, he is not, like you, a pure spirit. Never having been a human (Oh that abominable advantage of the Enemy's!) you don't realise how enslaved they are to the pressure of the ordinary. I once had a patient, a sound atheist, who used to read in the British Museum. One day, as he sat reading, I saw a train of thought in his mind beginning to go the wrong way. The Enemy, of course, was at his elbow in a moment. Before I knew where I was I saw my twenty years' work beginning to totter. If I had lost my head and begun to attempt a defence by argument I should have been undone. But I was not such a fool. I struck instantly at the part of the man which I had best under my control and suggested that it was just about time he had some lunch. The Enemy presumably made the counter-suggestion (you know how one can never quite overhear What He says to them?) that this was more important than lunch. At least I think that must have been His line for when I said "Quite. In fact much too important to tackle it the end of a morning", the patient brightened up considerably; and by the time I had added "Much better come back after lunch and go into it with a fresh mind", he was already half way to the door. Once he was in the street the battle was won. I showed him a newsboy shouting the midday paper, and a No. 73 bus going past, and before he reached the bottom of the steps I had got into him an unalterable conviction that, whatever odd ideas might come into a man's head when he was shut up alone with his books, a healthy dose of "real life" (by which he meant the bus and the newsboy) was enough to show him that all "that sort of thing" just couldn't be true. He knew he'd had a narrow escape and in later years was fond of talking about "that inarticulate sense for actuality which is our ultimate safeguard against the aberrations of mere logic". He is now safe in Our Father's house. --Screwtape, in The Screwtape Letters by CS Lewis
