12 AUG 2014 by ideonexus


At a young age, Gates was already an autodidact, someone compelled to learn for himself what he needed to know. Over the course of his life, Gates has maintained this habit: He dropped out of college after two years, but he has continued his education through incessant reading and conversing. Michael Specter, a New Yorker writer who profiled Gates for the magazine, has said that the Microsoft founder “is one of these autodidacts who reads, reads, reads. He reads hundreds of books about immu...
Folksonomies: education learning
Folksonomies: education learning
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31 OCT 2012 by ideonexus

 The Difference Between Pretend and Simulation

To dissimulate is to pretend not to have what one has. To simulate is to feign to have what one doesn't have. One implies a presence, the other an absence. But it is more complicated than that because simulating is not pretending: "Whoever fakes an illness can simply stay in bed and make everyone believe he is ill. Whoever simulates an illness produces in himself some of the symptoms" (Littré). Therefore, pretending, or dissimulating, leaves the principle of reality intact: the difference is...
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When a person pretends to be ill, they just lie in bed; but when they simulate illness, they produce actual symptoms, thus blurring the lines of reality.

14 SEP 2011 by ideonexus

 Avicenna Describes His Learning

At night I would return home, set out a lamp before me, and devote myself to reading and writing. Whenever sleep overcame me or I became conscious of weakening, I would turn aside to drink a cup of wine, so that my strength would return to me. Then I would return to reading. And whenever sleep seized me I would see those very problems in my dream; and many questions became clear to me in my sleep. I continued in this until all of the sciences were deeply rooted within me and I understood them...
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Disciplined, exhaustive, and systematic.

20 MAY 2011 by ideonexus

 Enjoying Science Requires Effort

When you have reached and entered the gates of science, how are you to use and enjoy this new and beautiful land? This is a very important question for you may make a twofold use of it. If you are only ambitious to shine in the world, you may use it chiefly to get prizes, to be at the top of your class, or to pass in examinations; but if you also enjoy discovering its secrets, and desire to learn more and more of nature and to revel in dreams of its beauty, then you will study science for it...
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Many don't love nature and don't fall in love with science as a result.

21 APR 2011 by ideonexus

 Peter Norvig: How Well Does the Program Run When it Isn't...

And think about failure modes—I remember one of the great lessons I got about programming was when I showed up at the airport at Heathrow, and there was a power failure and none of the computers were working. But my plane was on time. Somehow they had gotten print-outs of all the flights. 1 don't know where—there must have been some computer off-site, i don't know whether they printed them that morning or if they had a procedure of always printing them the night before and sending them ...
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An important use-case for any software, what's the work-around for when the program isn't running?

03 JAN 2011 by ideonexus

 A Reversible NAND Gate

The great discovery of Bennett and, independently, of Fredkin is that it is possible to do computation with a different kind of fundamental gate unit, namely, a reversible gate unit. I have illustrated their idea--with a unit which I could call a reversible NAND gate. It has thre inputs and thre outputs. Of the outputs, tow, A' and B', are the same as two of the inputs, A and B, but the third input works this way. C' is the same as C unless A and B are both 1, in which case it changes whateve...
Folksonomies: computing
Folksonomies: computing
  1  notes

Feynman describes a reversible logic gate, with three inputs and three outputs, one of which tracks the change in input and output, allowing the computer to reverse its operation and potentially pursue a different route.