Viswanathan K's Thoughts

How fast can a camera take photos? Vaclav Slim talks about just that topic in Numbers Don’t Lie . In the early 1870’s, Leland Stanford challenged his employee, Easweard Muybridge, to develop a camera that could settle an old debate: Are all four legs of a horse in the air when it runs? To answer the question, Muybridge came up with a camera with a shutter speed of 1/1,000 of a second in 1878. The question could finally be answered, with (photographic) proof: Yes, all four hooves of a horse are indeed airborne at the same time.   Soon, the shutter speed increased to 1/10,000 of a second. By 1940, it hit the millionth of a second mark.   In 1999, Ahmed Zewail won the Nobel Prize in Chemistry for developing a rapid laser technique that could capture the transition states of chemical reactions on a scale of femtoseconds (a millionth of a billionth of a second). Today, we can detect events separated by attoseconds (a billionth of a billionth of a second). It allows us to “s...

In The Song of the Cell , Siddhartha Mukherjee narrates an amusing incident from his younger days. He was still a very junior person in the medical chain, and his mentor was an Italian postdoc, Enzo Cerundolo, a garrulous man who nonetheless barely spoke to Mukherjee: “He rushed around the lab, navigating his way past me as if I were some irritating piece of equipment that someone had off-loaded in the wrong place.”   One aspect of the project the lab was working on at the time involved repeatedly freezing, then thawing a sample. The sequencing mattered – two thaws in a row, or two freezes in a row would kill whatever was in the sample. Unfortunately for Enzo, the assistant in charge of it (also an Italian) had gone on vacation. Nobody knew if the next step was to freeze or to thaw.   Mukherjee asked to see the tube. On its bottom, in barely visible ink, he saw the letters C, S, C, S, C, S. He asked Enzo what the Italian word for “freeze” was. Congelare . And the Ita...

The stereotype image on population growth is that only the southern states rates are declining while the rest of India is closer to the UP-Bihar end of the spectrum. Not true at all. While UP-Bihar are indeed the worst, most Indian states have low birth rates, not just the southern states. So much so that, as Raghu S Jaitley says : “We have gone from a Total Fertility Rate (TFR) of 3 to 2 in under 12 years; possibly the fastest such transition in the past century. Most of the developed economies of today took more than half a century for a similar drop.”   A generation back, we were told our population was one of the big reasons why India was poor, doing badly economically. So such a reduction in TFR must be a good thing, right? Well: “We have reached a TFR of under 2 now at a per capita of about US$3000, while such levels were reached by other economies at more than US$15,000.” Two major exceptions to that were Japan and China. Both overcame a low TFR before they becam...

If a country wants to keep its population unchanged, each couple should have 2.1 kids on average. The “extra” 0.1 is to adjust for the odd kid who dies early.   In Numbers Don’t Lie , Vaclav Slim points out that a radical change in the demographics of a country (increase or decrease) has historically “had enormous demographic, economic, and strategic implications”. As Europe’s share of global population fell from 18% in 1900 to 9.5% in 2020, so has its global significance. Asia, in the same period, has moved in the opposite direction on both fronts. From now to 2070, by this metric, Africa’s share should increase.   No country has ever managed to achieve exactly (or very close to) the replacement rate of 2.1. Japan, (in)famously dipped well below that number. But how far below 2.1 can a country go and still “recover”? Historical data suggests that below 1.5, such reversals are very unlikely. Spain, Italy, and Romania are at 1.3; Japan, Ukraine, Greece, and Croatia are...

The Zerodha article points out that slowly but steadily, Chinese manufacturing moved up the value chain. Patience and strategy matter. Uniquely, the Chinese government identified some sectors as critical (e.g. telecom) and poured money and helped arm-twist Western companies into sharing technological knowhow with Chinese partners. To help domestic companies grow in those sectors, when they were new and inferior initially, China would prevent Western (superior) tech from being sold, thereby creating a “protected home market to develop in”. “This model played out in multiple sectors — solar panels, electric vehicles, high-speed rail equipment. The value chain expanded.” Of course, this can be risky –local companies may stay at low quality only with no fear of competition from superior products. Remember the License Raj? ~~   China adopted a spray-and-pray approach. “They just threw money at everything and hoped something worked… even if the waste along the way was colossal… China go...

This Zerodha article analyzed how China became the manufacturing hub of the world. And whether India could replicate those steps. When Mao died, Deng Xiaoping took over. A major decision at this point was to learn from Singapore “a once backwater little fishing island had begun to cement its place in world conversations”. It was a good place to start because Singapore had started poor with a lot of Chinese origin citizens with little or no qualifications, a situation similar to China in ’79. ~~   A major outcome of the Singapore visit was the creation of the SEZ (Special Economic Zone): “These special enclaves didn’t have the same rules as the rest of China. Different rules applied — freer movement of capital, flexible labour laws, easy land acquisition, consistent, uninterrupted electricity. And quick customs clearances.” (India followed the same SEZ technique for the IT sector).   Crucially, one of the most famous SEZ’s was created in (now famous) Shenzhen bec...

The ethanol-as-fuel topic is in the news. Thankfully, it seems to be without too many politicians (for now, at least). And so the points being made by both sides make sense; they are not the usual mudslinging based on one’s political affiliations. I read two such well-written articles on the topic, one by Nithin Sasikumar and the other by Ajit Ranade in Deccan Herald . ~~   The drive to ethanol didn’t start recently; it has been going on steadily since 2013-14. The E20 target (The number ‘20’ here means 20% ethanol) has in fact been reached 5 years ahead of plan – imagine that, for government execution cutting across parties and spread over a decade! (India reached E10 in 2022; its target is 100% eventually). ~~   What are the reasons for the ethanol policy? The first one is that India imports a huge amount of oil; and that bill is only going to keep increasing. Saving money and forex was the primary driver. As the ratio of ethanol increases, the savings on that ...

A virus, so to speak, “goes native”, writes Siddhartha Mukherjee in The Song of the Cell , i.e., it infiltrates the cell and hijacks the cell’s protein making apparatus to manufacture viral proteins.   This raises an intriguing question – since antibodies “cannot enter cells” (the cell membrane prevents them from entering), how then do they identify which cells have been infected?   If the antibody couldn’t “peek” inside the cell, was the viral protein coming out of the cell? Nope, that wasn’t the case either. The mystery only deepened – how then were the antibodies identifying which cell was infected?   The answer was found only in the 1980’s. Any cell, as we know, produces energy by processing the food we eat. And like every process in the universe, this produces waste by-products. “The cell’s meat grinder – the proteasome - … then chews them (the waste, including the viral protein) into smaller pieces.” The waste of course has to be ejected from the cell. And, as we ju...

Why should one write, asks (and answers) Shane Parrish. No, writing is “not just a vehicle to share ideas with others”. Rather: “Writing is the process by which you realize that you do not understand what you are talking about. Importantly, writing is also the process by which you figure it out.”   Paul Graham wrote the same thing: “A good writer doesn't just think, and then write down what he thought, as a sort of transcript. A good writer will almost always discover new things in the process of writing.”   In addition, writes Parrish: “Writing requires the compression of an idea. When done poorly, compression removes insights. When done well, compression keeps the insights and removes the rest. Compression requires both thinking and understanding.” I guess that’s what summary writing at school was trying to teach!   Another purpose of writing is to understand things for yourself – this is often called the Feynman learning technique , after the p...

Penicillin . The most famous antibiotic of all time. In The Song of the Cell , Siddhartha Mukherjee asks and answers two questions about penicillin that had never even occurred to me. How does penicillin differentiate microbial cells from human cells? How did it work so well against such a wide range of microbes? (Before our overuse of antibiotics undid its effectiveness)   A slight digression first. In my 11 yo daughter’s Biology book, there is a chapter on cells. It mentions bacteria as examples of unicellular plants. Plants, that’s right, bacteria are plants!   Though Mukherjee doesn’t mention it, that weird fact (bacteria are plants) is the starting point of the answer to both questions. A plant cell has a cell wall. Bacteria being plants have cell walls. To create those cell walls, they have a particular enzyme. Humans cells, being animal cells, don’t have cell walls – hence, human cells don’t need or have that enzyme.   Penicillin “kills” those enzymes that create...

In The Song of the Cell , Siddhartha Mukherjee writes : “In the history of biology, there are valleys of silence that follow the peaks of monumental discoveries.” Like when Benjamin Marten reasoned that TB was caused by microscopic organisms in 1720. It would take another century before Robert Koch and Louis Pasteur linked diseases to microbial cells. Or when Mendel discovered genes in 1865. It was followed by 40+ years of no mention of genes.   But the reality is different: “If you zoom into these valleys of history, they are far from silent or inactive. They represent extraordinarily fecund periods when scientists try to wrap their minds around the magnitude, generality, and explanatory power of a discovery.” More questions follow in this period. Does the new idea explain any other “previously inexplicable observations”? Are there any further levels of organization beyond what was proposed?   Quite often, writes Mukherjee, one needs new instruments and model...

In Watterson’s telling, the fight with the Syndicate was David v Goliath. Goliath with its lawyers and money and binding legalese. David with a “pencil in hand and heart full of uncompromisable values”. Shades of grey v Black and White, as he famously captured in this strip:   Not entirely true, writes Matthew Morgan. Merchandising could only work if the strip continued, if the creator didn’t publicly air grievances. Options Watterson did have. In fact, the Syndicate did worry he might abruptly quit.   Besides, as the Syndicate bosses showed Watterson, others were creating illegal and unauthorized Calvin and Hobbes merchandise anyway. At least by licensing it, Watterson could control the narrative, the format. Watterson still said No; and the Syndicate backed off. Even rewrote the terms of his contract. ~~   One of the almost unheard-of terms of the revised contract was the sabbatical (extended leave from work, for between 3 and 12 months). Why was it unhear...

Reading in the Brain by Stanislas Dehaene explains at length how we read. The first chapter starts with the eye. I was surprised that: “The fovea, which occupies 15 degrees of the visual field is the only part of the retina that is genuinely useful for reading.” Just 15 degrees of the visual field is useful for reading? No wonder then: “Our eyes do not move continuously across the page… They move in small steps.” In steps of 15 degrees coverage, that is.   McConkie and Rayner’s experiment proves this window is real. The setup involves a special device that tracks eye movement of the wearer. It then changes the visual display on the screen accordingly. In real time . It shows only a few characters to the left and right of the center gaze, the rest it fills with x’s.             We the pexxx xx xxx xxxxxxx xxxx xx xx xxxxxx xx When the eye moves, the screen gets updated to align where the gaze has moved: ...

I read this Hourly History book on the Ottoman empire . The book felt like reading through Mughal history in India, constrained to an hour of reading (such a book would probably have been limited to Babur, Akbar, Aurungzeb, and fading away with Bahadur Shah Zafar with the rise of the British; with some tidbits like the Taj Mahal thrown in). Except that, unlike the Mughal era, a lot of the Sultans were short-lived, and so there was a lot of churn in policies and governance mechanisms. While not a very informative book (it has too much to cover), it’s enough to get the broad brushstrokes. ~~   One amusing tidbit went like this. When the empire was still small and growing, the Sultan Murad II felt he had secured the place with expansion and treaties. So he abdicated the throne in favour of his son, Mehmed II. Except the son was just 12 years old! The Sultan retired to “enjoy a lifestyle worthy of an ex-Sultan”. But, as would happen repeatedly, the areas to the west, being Chr...

Why did Bill Watterson fight the merchandising of Calvin and Hobbes so much, so bitterly, asks and answers Matthew Morgan.   One gets a clue from a question fans of the strip asked: Was Hobbes real or imaginary? Here is Watterson’s own Zen koan-like answer: “Calvin sees Hobbes one way, and everyone else sees Hobbes another way. I show two versions of reality, and each makes complete sense to the participant who sees it. I think that’s how life works.”   The article summarizes Watterson’s answer perfectly: “You could say Hobbes is both imaginatively real and really imaginary, depending on your perspective. Hobbes can be either, which also means he’s both. Is Hobbes a tiger or a toy? Yes.”   If Watterson looked at Hobbes with this Zen/quantum mechanical duality lens, one can understand: “(Why Watterson was so averse to) some toy manufacturer settle it by turning Hobbes “into a stuffed toy for real, and deprive the strip of an element of its magic”. ...

I found Matthew Morgan’s long post on Bill Watterson, the creator of Calvin and Hobbes , refreshing – it provided a new perspective. ~~   The post starts with Watterson in his college dorm (hostel) “thinking that his dorm room needs an amateur rendition of Michelangelo’s “Creation of Adam”! “What the work will lack in “colour sense and technical flourish” it’ll make up for with comedy — specifically “the incongruity of having a High Renaissance masterpiece in a college dorm that had the unmistakeable odour of old beer cans and older laundry”.” Like all college kids, it’s only when he’s half done that he remembered he should have asked for permission! He goes to ask the housing director. Who immediately guesses the kid’s probably already done it. So the director agrees, on the condition the ceiling be restored to its original condition before the term ends. Watterson agrees, completes his “work”, and then wipes it clean. ~~   Calvin and Hobbes was always a one...

Yoga postures are hard enough; try doing them with your eyes closed and it becomes almost impossible. Kids on the other hand seem do those same poses fairly easily with their eyes closed.   I understood why it’s easier for kids to balance with their eyes closed as I was reading this excerpt from Eureka!: Mindblowing Science Every Day of the Year . The answer starts with an interesting observation: “Children obviously enjoy the feeling of dizziness -- just look at how roundabouts in parks and playgrounds are packed with young­sters.” Why is that? Because, it turns out, our balance system is controlled by 3 senses: Inner ear (vestibular system) Receptors in joints and muscles (proprioceptor system) Eyes (visual system)   These 3 systems mature at different rates from the time we are born: “The vestibular system is fully operational by the time a child has reached 6 months of age; proprioceptors need three or four years more. The development of the visual elem...

Malcolm Gladwell’s The Bomber Mafia talks of several problems from the Second World War that I had never thought about. They do seem obvious once you hear of it…   With bomber planes flying at high speeds at high altitudes (to avoid being hit by anti-aircraft fire), the odds of any bomb landing where one wanted it to was remote. What was the windspeed? The speed of the aircraft? Was the plane level when you dropped the bomb or moving up/down? Or side to side? And you couldn’t even see the tiny target so far below clearly anyway.   Even though some devices (they were practically analog computers!) were built to try and solve this problem, they never worked out. Because in practice, the person operating it had to set the dials while under enemy fire, in a shaking plane, and sometimes with clouds hiding the target altogether.   This could explain why both the Allies and the Axis powers practiced indiscriminate bombing during the war. If you can’t aim precisely, ...

There’s this blogger who goes by the moniker Southern Punk. Recently, he (she?) wrote a thought-provoking post titled “Why does Rome keep showing up?” . As American power (hard and soft) seems to be on the decline, more and more parallels to the slow decline of Rome are common.   He then brings up that famous Roman phrase, “Bread and circuses”. “Most people think it means entertainment. It doesn't. Not exactly. The bread kept people fed. The circus kept people occupied. The point wasn't the games themselves. The point was attention .”   Attention. Nowadays, the US government “seems to communicate through spectacle” only . “I don't remember a time when everything felt this performative… Sometimes it feels like we're living inside a never-ending competition for screen time.” He contrasts that with how things used to be. Once upon a time. “I miss the idea that government was supposed to be boring. Boring meant people were working. Boring meant budgets were...

How is China positioning itself to become the new reserve/international currency? China, writes Way Yuhl, has learned from and copied America.   Remember the New Silk Road project (aka Belt and Road), whereby China “financed roads, railways, ports, power plants, and telecommunications networks” across Asia, Africa and Latin America? Well, that’s not entirely about profits from interest on the loans. It is also how China has built financial leverage with much of the developing world. If their infrastructure projects all rely on China, well, they are likely to align/agree with China on economic and financial matters. On a side note, Yuhl mentions the Sri Lanka port that was handed over to China for 99 years when Sri Lanka couldn’t repay. While India’s concern was Chinese presence so close to our borders/waters, the West cited it as an example of Chinese predatory lending ( zamindar style). Guess what? “America used the same mechanism after WWI, converting Britain’s debt depe...