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Text - "Relativity: The Special and General Theory" Albert Einstein
It is not clear what is to be understood here by "position" and "space." I stand at the window of a railway carriage which is travelling uniformly, and drop a stone on the embankment, without throwing it. Then, disregarding the influence of the air resistance, I see the stone descend in a straight line. A pedestrian who observes the misdeed from the footpath notices that the stone falls to earth in a parabolic curve. I now ask: Do the "positions" traversed by the stone lie "in reality" on a straight line or on a parabola? Moreover, what is meant here by motion "in space" ? From the considerations of the previous section the answer is self-evident. In the first place we entirely shun the vague word "space," of which, we must honestly acknowledge, we cannot form the slightest conception, and we replace it by "motion relative to a practically rigid body of reference." The positions relative to the body of reference (railway carriage or embankment) have already been defined in detail in the preceding section. If instead of " body of reference " we insert " system of co-ordinates," which is a useful idea for mathematical description, we are in a position to say : The stone traverses a straight line relative to a system of coordinates rigidly attached to the carriage, but relative to a system of co-ordinates rigidly attached to the ground (embankment) it describes a parabola. With the aid of this example it is clearly seen that there is no such thing as an independently existing trajectory, but only a trajectory relative to a particular body of reference. In order to have a complete description of the motion, we must specify how the body alters its position with time ; i.e. for every point on the trajectory it must be stated at what time the body is situated there. These data must be supplemented by such a definition of time that, in virtue of this definition, these time-values can be regarded essentially as magnitudes (results of measurements) capable of observation. If we take our stand on the ground of classical mechanics, we can satisfy this requirement for our illustration in the following manner. We imagine two clocks of identical construction ; the man at the railway-carriage window is holding one of them, and the man on the footpath the other. Each of the observers determines the position on his own reference-body occupied by the stone at each tick of the clock he is holding in his hand. In this connection we have not taken account of the inaccuracy involved by the finiteness of the velocity of propagation of light.
Learn to type faster
You would surely like to spend more time on things you like. However, you feel that slow typing makes you loose a lot of time.
Bad typing habits are reinforced each time when you use your keyboard incorrectly (when a wrong finger clicks a given key). It makes you unable to type more quickly. Such inconspicuous wasting of time is terrible, because precious minutes accumulate in hours, days, weeks... irretrievably lost in life.
AgileFingers is a course that teaches how to type faster. It has been created by professionals, for current and future professionals. I'm the main creator of AgileFingers. As a programmer I know what it means to use the keyboard everyday, even a dozen or so hours.
Unfortunately, education systems focus on teaching handwriting rather than learning how to correctly type using the keyboard. Because no one teaches you to type properly, you get the wrong habits that you can not get rid of. Programs that aim to teach you how to type fast, mostly concentrate on the speed, not correctness. Therefore, using the wrong program, you can type faster, but incorrectly. In this case, if your work requires a lot of typing, you may have future health problems related to abnormal muscle tension in the hands and wrists. Besides, typing incorrectly is unnatural it will never lead you to achieving the speed you are able to achieve.
Before I started to study computer science, I learned how to type quickly using a program installed from a CD. I practiced every day for a few minutes for a good couple of months. I did not realize how great benefit it would bring in the future.
I have been a professional programmer for many years. When I think about how much time and health I didn't loose thanks to touch typing, I am glad that I have learned to type faster in the past.
AgileFingers is a course that will help you type faster and correctly. Virtual hands show which keys you should press and which fingers should be used for that. You do not have to focus on the text, just press an appropriate keyboard key with an appropriate finger. In time your muscles will remember the correct finger movements.
The road you need to go to master fast touch typing is relatively long and generally tedious. Writing texts is not a very exciting job. AgileFingers, however, makes that such a monotonous activity can be pleasant.
I wish you persistence in learning how to type faster. By investing your time now, you will save it much in the future.