15 MAR 2017 by ideonexus

 Forage on the Enemy

作戰: 故不盡知用兵之害者,則不能盡知用兵之利也。善用兵者,役不再籍,糧不三載,取用于國,因糧于敵,故軍食可足也。國之貧于師者遠輸,遠輸則百姓貧,近于師者貴賣,貴賣則百姓財竭,財竭則急于丘役,力屈財殫,中原內虛于家,百姓之費,十去其七,公家之費,破車罷馬,甲冑矢弩,戟楯蔽櫓,丘牛大車,十去其六。 Waging War: It is only one who is thoroughly acquainted...
Folksonomies: wargaming strategy war
Folksonomies: wargaming strategy war
  1  notes
 
31 MAY 2015 by ideonexus

 Hero of "Brave New World"

The hero of Brave New World is John, a young man who grew up on an Indian reservation in New Mexico. The reservation is inhabited by primitive peoples and maintained by the benevolent world government as a tourist attraction. It exists so that the civilized tourists can observe from a distance the nasty and brutish lives of people who have the misfortune to be unprotected by the cushions and comforts of technology. On the reservation, traditional religions and traditional customs are tolerate...
  1  notes
 
22 JUN 2013 by ideonexus

 A Brief History of Signals

Prior to the advent of practical electrical communication, human beings had been signaling over a distance in all kinds of ways. The bell in the church tower called people to religious services or “for whom the bell tolls”—the announcement of a death. We knew a priori several things about church bells. We knew approximately when services were to begin, and we knew that a long, slow tolling of the bells announced death. Thus we could distinguish one from the other, namely a call to relig...
Folksonomies: communications signals
Folksonomies: communications signals
  1  notes

From church bells, speech, body language, semaphores, fires, and smoke signals.

04 AUG 2012 by ideonexus

 Study is More Efficient Than Contemplation

吾嘗終日而思矣,不如須臾之所學也。吾嘗跂而望矣,不如登高之博見也。登高而招,臂非加長也,而見者遠;順風而呼,聲非加疾也,而聞者彰。假輿馬者,非利足也,而致千里;假舟楫者,非能水也,而絕江河。君子生非異也,善假於物也。
Folksonomies: education learning study
Folksonomies: education learning study
  2  notes

[Translated] Once I spent an entire day in thought, but it was not as good as a moment of study. Once I stood on tiptoe to gaze into the distance, but it was not as good as climbing to a high place to get a broad view. Climbing to a high place and waving will not make your arm any longer, but you can be seen from farther away. Shouting down the wind will give your voice no added urgency, but you can be heard more distinctly. By borrowing a horse and carriage you will not improve your feet, but you can cover a thousand li. By borrowing a boat and paddles you will not improve your ability in water, but you can cross rivers and seas. The noble person is by birth no different from others, but he is good at borrowing from external things.

29 MAR 2012 by ideonexus

 Example of Relativity

Imagine that George, who is wearing a spacesuit with a small, red flashing light, is floating in the absolute darkness of completely empty space, far away from any planets, stars, or galaxies. From George's perspective, he is completely stationary, engulfed in the uniform, still blackness of the cosmos. Off in the distance, George catches sight of a tiny, green flashing light that appears to be coming closer and closer. Finally, it gets close enough for George to see that the light is attache...
  1  notes

All motion is relative.

16 FEB 2012 by ideonexus

 Copernicus' Hypothesis

After I had addressed myself to this very difficult and almost insoluble problem, the suggestion at length came to me how it could be solved with fewer and much simpler constructions than were formally used, if some assumptions (which are called axioms) were granted me. They follow in this order. There is no one center of all the celestial circles or spheres. The center of the earth is not the center of the universe, but only of gravity and of the lunar sphere. All the spheres revolve about...
Folksonomies: history science hypothesis
Folksonomies: history science hypothesis
  1  notes

That the Earth revolves around the Sun.

17 JAN 2012 by ideonexus

 Truth is the approximation of thought to reality

...reality is a system, completely ordered and fully intelligible, with which thought in its advance is more and more identifying itself. We may look at the growth of knowledge … as an attempt by our mind to return to union with things as they are in their ordered wholeness…. and if we take this view, our notion of truth is marked out for us. Truth is the approximation of thought to reality … Its measure is the distance thought has travelled … toward that intelligible system … The d...
Folksonomies: empiricism reality
Folksonomies: empiricism reality
  1  notes

Our growth of knowledge is an "attempt by our mind to return to union with things as they are in their ordered wholeness."

01 JAN 2012 by ideonexus

 The Parallax Method

It is possible to measure how far away from us each galaxy is. How? How, for that matter, do we know how far away anything in the universe is? For nearby stars the best method uses something called 'parallax'. Hold your finger up in front of your face and look at it with your left eye closed. Now open your left eye and close your right. Keep switching eyes, and you'll notice that the apparent position of your finger hops from side to side. That is because of the difference between the viewpoi...
Folksonomies: measurement parallax
Folksonomies: measurement parallax
  1  notes

Using the change in position of an object when viewed from two different points can be used to determine its distance from you.

01 JAN 2012 by ideonexus

 We Will Retrieve Pioneer 10

Pioneer 10 is the first interstellar spacecraft launched by mankind. It was also the fastest spacecraft launched, to the date of its departure. But it will take eighty thousand years for Pioneer 10 to reach the distance of the nearest star. Because space is so empty, it will never enter another Solar System. The little golden message aboard Pioneer 10 will be read, but only if there are interstellar voyagers able to detect and intercept Pioneer 10. I believe that such an interception may occ...
  1  notes

As it has 80,000 years until it reaches the nearest star, we will overtake it, which will be like Columbus being overtaken by an aircraft carrier.

12 DEC 2011 by ideonexus

 Earth's Curve, Flat Maps, and the Fastest Route Between T...

Imagine, say, that you wanted to travel from New York to Madrid, two cities that are at almost the same latitude. If the earth were flat, the shortest route would be to head straight east. If you did that, you would arrive in Madrid after traveling 3,707 miles. But due to the earth's curvature, there is a path that on a flat map looks curved and hence longer, but which is actually shorter. You can get there in 3,605 miles if you follow the great-circle route. which is to first head northeast,...
Folksonomies: geometry models maps
Folksonomies: geometry models maps
  1  notes

Because the Earth is a sphere and maps are flat, the fastest route between two points on a map is actually a curved line and airlines take this into account when plotting flight paths.