Cherish the Memories

Fun, Experience, Travel

S Chandrasekhar – One of the Great Scientist of India

Google Doodle Celebrates S Chandrasekhar Birthday !!!!

Described as a “child prodigy” and hailed as the first astrophysicist to win a Nobel Prize for his theory on the evolution of stars, Diwali on Thursday would have been Subrahmanyan Chandrasekhar’s 107th birthday.

In his honour, Google is changing its logo in 28 countries to a doodle, or illustration, of him and the Chandrasekhar Limit.

But in his lifetime, the Indian American astrophysicist was not always recognised for his achievements. This is his story:

Intellectual family

  • Born in Lahore in 1910 to a Tamil family, Chandrasekhar was home tutored until age 12.
  • In his autobiography, Chandrasekhar referred to his mother as “My mother Sita was a woman of high intellectual attainments”.
  • His uncle, Sir CV Raman, won the Nobel Prize in Physics in 1930.
  • Also in 1930, Chandrasekhar completed his bachelor’s degree in physics at the Presidency College in Madras, India (known today as Chennai).
  • Chandrasekhar was then awarded a scholarship by the government of India to pursue graduate studies at the University of Cambridge in the UK. He completed his PhD studies in 1933.
  • Married to Lalitha Doraiswamy in the southern Indian city of Madras, Chandrasekhar praised his wife’s “patient understanding, support, and encouragement” and called those the “central facts of my life”.

Late recognition

  • Working as a researcher at Cambridge University, Chandrasekhar made his most significant discovery, which became known as the Chandrasekhar Limit. But his colleagues were sceptical of his discovery and sought to discredit it.
  • According to the Open University, English astronomer Sir Arthur Eddington persuaded Chandrasekhar to present his findings at the Royal Astronomical Society in London on January 11, 1935.
  • At the astronomical society, Eddington then gave a lecture to “demolish the young researcher’s calculations and theory, dismissing it as mere mathematical game playing”.
  • More than 30 years later, in 1966, scientific research with computers and the hydrogen bomb gave credit to Chandrasekhar’s calculations.
  • Black holes, central to Chandrasekhar’s theory, were identified in 1972. His calculations contributed to the understanding of supernovas, neutron stars and black holes.

Security clearance

  • In 1937, Chandrasekhar immigrated to the US and started working at the University of Chicago.
  • During World War II, he was invited to join the Manhattan Project at Los Alamos to make a nuclear bomb, but delays in the processing of his security clearance prevented him from joining.
  • Still, Chandrasekhar contributed to the war effort, working for the Ballistic Research Laboratory in Maryland.
  • In 1953, 16 years after he came to the US, Chandrasekhar was granted US citizenship. He died in Chicago at the age of 85.


  • In his book, Truth and Beauty, he offered his advice to aspiring scientists, “What a scientist tries to do essentially is to select a certain domain, a certain aspect, or a certain detail, and see if that takes its appropriate place in a general scheme which has form and coherence; and, if not, to seek further information which would help him to do that.”
  • In his autobiographical sketch for the Nobel Prize ceremony, he described what motivated his scientific quest, “When, after some years of study, I feel that I have accumulated a sufficient body of knowledge and achieved a view of my own, I have the urge to present my point of view, ab initio, in a coherent account with order, form, and structure”.
  • In an interview, Chandrasekhar praised the US, “I have one advantage here in the United States. I have enormous freedom. I can do what I want. Nobody bothers me”.


  • When Chandrasekhar was 43, he was awarded the Gold Medal of the Royal Astronomical Society.
  • At the age of 56, he was awarded the National Medal of Science for his numerous contributions to stellar astronomy, physics and applied mathematics.
  • At the age of 61, he was honoured with the Draper Medal from the US National Academy of Science for his leadership in, and major contributions to, the field of astrophysics.
  • In 1983, at 73 years of age, Chandrasekhar shared the Nobel Prize in Physics with William Fowler for his theoretical studies of the physical processes of importance to the structure and evolution of the stars.



Abhinav’s First Share

Relationship between Share market and Hot wheels.
Today’s morning conversation between me and Abhinav which happened when we were riding on bike.


Abhinav: Daddy, are there any shares around Rs 200.

Me:          Why are you asking? Yes , plenty of shares are there below 200

Abhinav: I have pocket money of Rs 200 and I want to spend by buying share.

Me:          Very good.

Abhinav: Pl get all documents and details of shares. Let me select.

Me:          Omg. Documents !!!

Abhinav: Is Hot wheels share available?

Me:          No. Evening we will select your first share.

Me and Priya was very proud of his thought process.

My Mom just quoted Tamil Proverb ” Thai 8 adi pancha, kutti 16 adi payum!! “

Abhinav’s Latest Drawing

One of the wedding invitation has Lord Vinayaga picture and I asked Abhi to draw. He agreed and He drew a really very good that too very fast. He has knack of drawing skills and i need to support him with proper tools and coaching.

Black & White

With Color

Note: Lord Vinayaga is really artist friendly. everybody like to draw him. Who is such a inspiration and Motivator.

Take the Challenge

Take the Challenge

Very Motivational note.

பூமியில் விதைக்கப்பட்ட விதை கூட எதிர்ப்பைச் சமாளித்து முளைத்துக் காட்டுகிறது !

ஒவ்வொரு நாளும் காட்டில் சிங்கத்தால் கொல்லப்படுகின்ற நிலையில் உயிர் வாழும் மான் கூட பிரச்சனைகளை சமாளிக்கின்றது !

பெரிய மீன்களால் ஆகாரத்திற்காக விழுங்கப்படும் நிலையிலிருக்கும் சிறிய மீன்களும் கடலில் புலம்பாமல் வாழ்கின்றன !

மனிதர்களால் எப்பொழுது வேண்டுமானாலும் வெட்டப்படுகின்ற வாழ்க்கையை அனுபவிக்கின்ற மரங்களும் நிமிர்ந்து நிற்கின்றன !

ஒவ்வொரு நாளும் ஆகாரத்திற்காக பல மைல்கள் தூரம் பறந்தாக வேண்டிய பறவைகளும் மனம் சலிப்படையாமல் முயற்சி செய்கின்றன !

சிறியதான உடலையும், பல கஷ்டங்களையும் சமாளிக்க வேண்டிய கட்டாயத்திலிருக்கும் எறும்புகள் கூட துவண்டு போகாமல் வாழ்ந்து காட்டுகின்றன !

தண்ணீரே இல்லாத பாலைவனத்தில் உயிர் தரிக்க வேண்டிய நிலையிலிருக்கும் ஒட்டகங்களும், எங்கும் ஓடிப்போகாமல் அதில் வாழ்ந்து காட்டுகின்றன !

ஒரு நாள் மட்டுமே வாழ்க்கை என்ற நிலையிலிருக்கும் பலவகை பூச்சிகளும், அந்த ஒரு நாளில் உருப்படியாக வாழ்கின்றன !

இப்படி பலகோடி உயிரினங்கள் உலகில் வாழ முடியுமென்றால் உன்னால் வாழ முடியாதோ ? ! ?

எப்படியும் வாழ்ந்தே ஆகவேண்டிய வாழ்க்கை . . .

அதை ஏன் புலம்பிக்கொண்டு வாழ்கின்றாய் !
அதை ஏன் நொந்துபோய் வாழ்கின்றாய் !
அதை ஏன் வெறுத்துக்கொண்டு வாழ்கின்றாய் !
அதை ஏன் தப்பிக்கப் பார்க்கிறாய் !
அதை ஏன் அழுதுகொண்டு வாழ்கின்றாய் !

சந்தோஷமாகத்தான் வாழ்ந்து பாரேன் !

எனது அஹம்பாவங்களை தவிடுபொடியாக்கி எனக்குப் பணிவைத் தந்த என் கஷ்டங்களுக்கு மனதார நன்றி !

என்னை அவமரியாதை செய்து எனக்கு வைராக்கியம் வரக்காரணமான என்னைத் தன் விரோதியாய் பார்ப்பவருக்கு மனதார நன்றி !

எனக்கு வலியைத்தந்து  அடுத்தவரின் வலியை எனக்குப் புரியவைத்த புரியாத நோய்களுக்கு மனதார நன்றி !

எனக்கு ஆரோக்கியத்தின் அவசியத்தை உள்ளபடிச் சொல்லிக்கொடுத்த, என் பலவீனத்திற்கும்,உடலுக்கும் மனதார நன்றி !

என்னை ஆழமாக சிந்திக்கவைக்க எனக்கு மிகுந்த துயரத்தைத் தந்த என்னுடைய பிரச்சனைகளுக்கு மனதார நன்றி !

என் பலத்தை நான் உணர்ந்து என் வாழ்வை நானே நடத்தக் காரணமான என்னை ஒதுக்கித் தள்ளியவர்களுக்கு மனதார நன்றி !

என் உடல் உறுப்புகளின் மதிப்பை எனக்கு தெளிவாய் சொல்லிக்கொடுத்த உடல் ஊனமுற்றோருக்கு என் மனதார நன்றி !

மனித வாழ்க்கை நிலையில்லாதது என்பதை எனக்குத் தெளிவாகப் புரியவைத்த மரணத்திற்கு மனதார நன்றி !

என் பெற்றோரின் பெருமையை, என் புத்தியில் அழுத்தமாய் பதித்த அனாதை இல்லங்களில் வாழ்வோருக்கு மனதார நன்றி !

ஒரு சிரிப்பினால் உலகையே வசப்படுத்தமுடியும் என்பதை எனக்குச் சுலபமாய் புரியவைத்த குழந்தைகளுக்கு மனதார நன்றி !

பணத்தினால் மட்டுமே வாழ்வில் எல்லா சுகமும் கிடைத்துவிடாது என்பதைக் காட்டிய நிம்மதியில்லாத பணக்காரர்களுக்கு மனதார நன்றி !

பக்தி என்பது வெளிவேஷமல்ல என்பதை எனக்குப் பயங்கரமாய் புரியவைத்த வெளிவேஷதாரிகளுக்கு எப்பொழுதும் மனதார நன்றி !

நாமஜபத்தின் அற்புத மஹிமையை எனக்குச் சரியாகப் புரியவைத்த என்னுடைய பாபங்களுக்கு என்றுமே மனதார நன்றி !

ஒவ்வொரு முறையும் மனிதரிடம் ஏமாந்துக் கொண்டிருந்த என்னை, அவர்களின் சுயரூபத்தை எனக்கு உணர்த்திய என் இறைவனுக்கு மனதார நன்றி !

இன்னும் பலருக்குச் சொல்லவேண்டும் ! இந்த வாழ்நாள் போதாது

ஆகவே வருகின்ற சவால்களை சமாளித்து நாம் வாழ வேண்டும்!!!

Picture: Google
Note: classroom2007 blog

Bitcoin for Dummies

Bitcoin for Dummies


Background:Some of my readers might have noticed that starting in the last year I have become more interested in Bitcoin and Cryptocurrencies. Don’t worry, I will not
invest gamble with them but I do think it is important to understand what is going on in this area as this could change many things especially within financial services. As this blog functions primarily as my own diary, I have decided to do a few posts about my own learnings so far.
Bitcoin explained (maybe wrongly) in 10 Points:

  1. In order to incentivize miners to actually perfom this task on an ongoing basis, they are rewarded a certain amount of Bitcoins if they succesfully post a verfied block onto the blockchain
  2. At its core, Bitcoin is (only) a network software protocol which defines the way the potential  members of the network communicate via cryptographic techniques
  3. Based on this protocol, the network then runs many copies of a transactional database which records each and every transaction since the beginning of Bitcoin
  4. The database itself consist of blocks of transactions which are “chained” together by clever cryprocraphic “trees” and pointers (“blockchain”), allowing relatively easy verification if the database has been retroactively changed
  5. The main challenge of this structure ist to avoid “double spending” or what one would call counterfeiting for normal currencies. How does the Bitcoin network  make sure that no one is able to spend his Bitcoins more than once ?
  6.  This problem has been solved cleverly by decentralizing the verification process to the socalled “Bitcoin” miners. Bitcoin miners in principle collect transactions into a new “block” and then verify each transaction if it is valid or an attempt to doublespend
  7. As the Bitcoin network is totally open (anyone with a computer can join, open an account or become a miner) , it is important to defend this process against malicious members who might verify for instance their own double spending attempts
  8. For this reason, the protocol contains a  competition feature. The miners compete against each other for posting a block (and reaping the Bitcoin reward) by solving a cryptographical puzzle which resembles to a certain extent a traditional lottery but requires significant amounts of computational power (“Proof of work method).
  9. Interestingly, this combination of reward and puzzle is the truly innovative feature of Bitcoin. So far this mechanism has ensured that the integrity of Bitcoin has not been compromised, without any control of a central authority. Up until Bitcoin was invented, no one really succeded in establishing such a decentralized verification process.
  10. Finally, Bitcoin cointains a feature which also makes it a truly electronic currency: If one sends Bitcoins via the protocoll, one can embed a set of instructions attached to the Bitcoin which then gets executed at the recieving end. In Bitcoin this is rarely used, mostly for a kind of trust account, but within Ethereum, this feature has been expanded to what is now called a “smart contract”.
Some Myth busting:
A) Bitcoin is fully anonymousThis is not true. Although anyone can open an account without verification and transfer Bitcoins, it doesn’t seem to be too difficult to track for instance IP addresses. Plus it is really easy to track back Bitcoins as all transactions are recorded forever. Only in combination with other tools (Tor etc.) , some sort of anonymity can be insured. In my opinion, cash bills still provide better anonymity than Bitcoin.
B) There are only 21 mn Bitcoins
This is just a number set in the current protocol and could be changed at any time. However this depends on the consent of the miners. Plus, every “hard fork” of the protocol automatically creates 21 mn new Bitcoins (or something similar) as it has happened with “Bitcoin cash”
C) Bitcoin is great for Micropayments as there are no transaction feesThere are several types of fees within Bitcoins. Indirect Transaction fees are currently mostly paid by issuing new Bitcoins to the miners.  Direct transaction fees need to be paid if fore some reasons the transaction should be executed quickly, as miners prefer transactions that offer them fees. One of the big issues is what will happen if no new Bitcoins can be created anymore and then miners are only compensated by fees. Or if the Bitcoin price falls significantly and the significant electricity consumption cannot be refinanced by the block award alone
D) Bitcoin works without Trust or a central authorityIt is true that no central authority decides what is going to happen with Bitcoin. But as a normal user for instance you have to trust either the Bitcoin Exchange if you buy Bitcoins or the programmers behind your Bitcoin Wallet Software that they don’t rip you off. There is also a small Group of people who are responsible for developing the “Bitcoin Core” which is the central protocol software. However their power is limited as the miners can decide which version of the protocol they want to run. Theoretically, a very large mining pool could influence Bitcoin (and even try to double spend) but then trust in the system would vanish quickly and the miners have achieved exactly nothing. Personally I would describe Bitcoin as a relatively well-balanced system with different authorities. Not unlike the power distribution of a country where the power is divided between the legislative, jurisdictive and executive branches. As Bitcoin is relatively new, it needs to be seen how stable this will be.
E) Bitcoin could replace theoretically any currency in the world
In its current form, Bitcoin has no chance to replace any currency. The main reason is that the transaction volume on the Bitcoin Blockchain is very limited. Due to its limited Block size, one Block can contain only around 1500-2000 transactions. As new blocks can only be created every 10 minutes, this limits the amount of transactions to around 12.000 per hour. Visa in contrast for instance claims to be able to handle 56.000 transactions per second. Technically it seems to be possible to improve Bitcoins transaction speed, but so far the Bitcoin “community” seems to have problems to agree on how to do this. So independent of any price fluctuations, Bitcoin in its current form is not a very good payment device from a technical point of view. It will be interesting to see if Bitcoin evolves quickly enough or if other crypto currencies will steal the thunder.Ethereum for instance is a lot quicker as they create blocks at a much faster rate.
F) Bitcoin is a fraud
Just a few days ago, Jamie Dimon called Bitcoin “a fraud”. Acccording to Wikipedia is defined as follows:
In law, fraud is deliberate deception to secure unfair or unlawful gain, or to deprive a victim of a legal right.
The founders of Bitcoin clearly didn’t intend anything in this way. They wanted to create a peer-to-peer payment system which cannot be hacked and I think they were succesful. That Bitcoin now is worth ~70 bn USD is clearly the result of a lot of speculation, but so far I see no intentional fraud.Many things are worth something because people believe it is worth something. When an old painting is sold for 180 mn USD, it is clear that this is a price that is not justified by the cost of the underlying material etc. but that this is the value that the buyer thinks it is worth.
In contrast, some (or all ?) of the hundreds of Initial Coin offerings happening at the moment do have all features of a typical fraud. My favorite coin is PonziCoin which clearly states its true nature. Bitcoin in contrast never did an “ICO”, it just developed the way it is. In a few years time we will see what value then will be assigned to Bitcoin, personally I think that this is not predictable.
More material:
For those who are more interested in the topic, I can highly recommend the Princeton lectures

Spell Bee International

This time Abhinav shown interest to participate in Spell Bee International though he dont like English much ( basically his 90% interest in Science and Maths only). But He want to see how the exam would be? We enrolled for the Inter-School level and exam happened last Month. Totally he would have spend 10 hours in preparation in which he gave more time for GK rather than English.

unnamed-13.pngYesterday His Teacher announced him as School Topper in his Grade. That means there are 12 section in Class 2. Each class has average of 35 students, out of which 10-12 students might be participated from his school. So it would be 150 students participation in Class 2 and Abhinav scored Topper and he is eligible to participate in State / Regional level competition. The cost of conducting Spell bee exam is Rs 400 plus for entry level and Rs 450 for next level. it is very very expensive relative to IMO (Olympiad exam is Rs 110). Spell bee management needs to consider this.

Some snapshots from Spell Bee website:

Spell Bee.png

About Spell bee Portion for Inter-School where as Abhinav became Topper.

Round I Spell it Right
 Round II Word Analysis
  Round III Inflects And Collocations
 Round IV

Round V

Find the Correct Sentence

General Knowledge


Innovation in stealing

how-to-prevent-sim-swap-fraPeople are always thinking of “Break the rules” for the good and bad cause. Citibank is so good and efficient in Security measures which i experienced in last 10 years of banking with them. In my last account statement, i got the information on Sim Swap methodology  and thought of sharing with all of course for the good cause. 🙂


Pl follow secure measures suggested by your bankers and ensure the hard earned money. Have a happy banking !!!



Happy New Year 2017

We wish you a very a happy and prosperous new year. Lets live healthy and pollute less.

Below are my resolutions for the year.

* Plant at-least two trees

* Read Four Books Which already Bought

* Continue to help (5% of earnings)  underprivileged

* Reduce anger and fat

Abhinav’s resolutions

* Eat at-least three different fruits and two different vegetables daily

* Change the sequence as ” Morning Study and Evening Play” (influence of Mahakavi)

* Wake up everyday at 530AM

IMO – International Mathematics Olympiad – 2016

Last year Abhinav participated IMO – 2015 and won Gold Medal & Fantastic ranking. Last year preparation was like less than one week because of Chennai Floods.

Link here:   old Post on IMO

But This year he prepared good and Enjoyed writing it. Questions were very tough and paper is attached  here.

Fingers crossed for Results.



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