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Sunday, June 23, 2013

Cryptography at Khan Academy


Khan Academy - Cryptography playlist 

Fundamental theorem of arithmetic - Composite numbers have a unique prime factorization.  

Substitution  Cipher (example Caesar Cipher - actually used by Julius Caesar) Fixed shift of every letter - Broken based on the frequency of the Letters in the English language. 

Polyalphabetic Ciphers - Shift based on a password. 

One Time Pad - random shifts for every letter based on a key - The encrypted message has equal letter frequencies. So code cannot be broken just based on the Cipher Text. 

Monday, June 17, 2013

Bill Gates and Aamir Khan on India


I was surprised that aamir held himself so well with Bill Gates. 

Gates : "If you think about whats one of the most tragic things in life. A lot of things come to mind. One of the things that comes to mind is a parent having to bury their child. Vaccines are important to fix this. Rich kids not at risk getting this and poor kids very much at risk not getting this - indicates innovation gone wrong". 

Aamir : "India budgets 1.4% of GDP for healthcare. Poor people probably pay more in indirect taxes as a proportion of their incomes. So they should consider it a right to hold the govt. accountable." 

Aamir " engage with life around you." 


Wednesday, June 12, 2013

The World as I see it - Einstein


Einstein at his home in Princeton, New Jersey
"How strange is the lot of us mortals! Each of us is here for a brief sojourn; for what purpose he knows not, though he sometimes thinks he senses it. But without deeper reflection one knows from daily life that one exists for other people -- first of all for those upon whose smiles and well-being our own happiness is wholly dependent, and then for the many, unknown to us, to whose destinies we are bound by the ties of sympathy. A hundred times every day I remind myself that my inner and outer life are based on the labors of other men, living and dead, and that I must exert myself in order to give in the same measure as I have received and am still receiving...

"I have never looked upon ease and happiness as ends in themselves -- this critical basis I call the ideal of a pigsty. The ideals that have lighted my way, and time after time have given me new courage to face life cheerfully, have been Kindness, Beauty, and Truth. Without the sense of kinship with men of like mind, without the occupation with the objective world, the eternally unattainable in the field of art and scientific endeavors, life would have seemed empty to me. The trite objects of human efforts -- possessions, outward success, luxury -- have always seemed to me contemptible.

"My passionate sense of social justice and social responsibility has always contrasted oddly with my pronounced lack of need for direct contact with other human beings and human communities. I am truly a 'lone traveler' and have never belonged to my country, my home, my friends, or even my immediate family, with my whole heart; in the face of all these ties, I have never lost a sense of distance and a need for solitude..."

"My political ideal is democracy. Let every man be respected as an individual and no man idolized. It is an irony of fate that I myself have been the recipient of excessive admiration and reverence from my fellow-beings, through no fault, and no merit, of my own. The cause of this may well be the desire, unattainable for many, to understand the few ideas to which I have with my feeble powers attained through ceaseless struggle. I am quite aware that for any organization to reach its goals, one man must do the thinking and directing and generally bear the responsibility. But the led must not be coerced, they must be able to choose their leader. In my opinion, an autocratic system of coercion soon degenerates; force attracts men of low morality... The really valuable thing in the pageant of human life seems to me not the political state, but the creative, sentient individual, the personality; it alone creates the noble and the sublime, while the herd as such remains dull in thought and dull in feeling.

"This topic brings me to that worst outcrop of herd life, the military system, which I abhor... This plague-spot of civilization ought to be abolished with all possible speed. Heroism on command, senseless violence, and all the loathsome nonsense that goes by the name of patriotism -- how passionately I hate them!

"The most beautiful experience we can have is the mysterious. It is the fundamental emotion that stands at the cradle of true art and true science. Whoever does not know it and can no longer wonder, no longer marvel, is as good as dead, and his eyes are dimmed. It was the experience of mystery -- even if mixed with fear -- that engendered religion. A knowledge of the existence of something we cannot penetrate, our perceptions of the profoundest reason and the most radiant beauty, which only in their most primitive forms are accessible to our minds: it is this knowledge and this emotion that constitute true religiosity. In this sense, and only this sense, I am a deeply religious man... I am satisfied with the mystery of life's eternity and with a knowledge, a sense, of the marvelous structure of existence -- as well as the humble attempt to understand even a tiny portion of the Reason that manifests itself in nature."

Albert Einstein (signature)


Saturday, June 08, 2013

Who rules ?

Wisdom of the crowds is not through gamification. Gamification produces intelligence  of crowds and doesn't assume highly informed crowds. 

Governing decisions for large societies : 
Can't be by individuals who presume to know everything. 
Can't be by small groups of people with specialized information. 
Best bet seems to be through complex interlocked systems. Are we informed enough to traverse this system and empowered enough to appeal for changes in the system.  

How do we leave it all up to business-people , who by definition have a narrow focus on gains for the few ? 



--
"I have no special talents. I am only passionately curious" - Albert Einstein (1879-1955)

Reactions to change

Plantos miros - grows tall , offers dependable shade , flowers rarely , copes with changes fairly well but doesn't morph itself to adapt. 

Plantos morphos -   changes with age and environment showing visibly new features , more seeds and new branches.

Plantos stuntos - don't  show signs of maturity, flower regularly as long as things don't change around them, need support. 


If they had free will, and were rational would there be just one type ?
Morphos seems very successful , is it really ?
 Or is it just losing itself everytime it changes. Wouldn't you want to shelter the morphos in the shade of miros - if you were the gardener.  


--
"I have no special talents. I am only passionately curious" - Albert Einstein (1879-1955)

Friday, June 07, 2013

Union Line Cemetery

via goodreads

Union Line Cemetery

In a graveyard in Mississippi
Lie the bones of a woman I loved
And those of a man I did not,
Though I am more like him than her.

Down a paved road off the federal highway 
Slicing diagonally from Mobile,
The road turns sharply as if
It was meant to dead end.

But as if someone moved the gates
The road bends goes on precisely south 
While the sun goes west away from the graves.

Marble benches wait through the undisturbed dust
For me to stop to pick sand spurs from my dress socks
And prick my fingers and remember I am alive.

While under clumps of low growing weeds,
Neat green grass and bare spots
These dead people rest in a Mississippi summer quiet, 
As they do in winter beneath a midnight ice storm.

Dead, yes, they are dead,
But I am alive and they are why I am so.
They keep us, our families, ourselves alive.

I wonder if in a few years when I am dead,
Ashes tossed in the Mississippi,
Will I hold anyone connected or only be dust,

Forever blown about where the delta turns to sea? 

Saturday, June 01, 2013

Inbox has gone google again

We get a lot of different types of email: messages from friends, social notifications, deals and offers, confirmations and receipts, and more. All of these emails can compete for our attention and make it harder to focus on the things we need to get done. Sometimes it feels like our inboxes are controlling us, rather than the other way around. 



--
"I have no special talents. I am only passionately curious" - Albert Einstein (1879-1955)

Past : 

http://www.youtube.com/watch?v=BkJs47FjBKc&feature=youtube_gdata_player



--
"I have no special talents. I am only passionately curious" - Albert Einstein (1879-1955)