Viswanathan K's Thoughts

After the Copper and Bronze Age, Tomas Pueyo goes into the Iron Age . Iron’s melting point is way higher (1538° C) than what those kilns could achieve, which is why it took a long time for iron to be used by humans. As bronze spread and became increasingly important, metallurgy and furnaces improved and we began to stumble upon iron as a byproduct. But: “Iron is harder to smelt, you also can’t work iron cold, and it’s actually softer than bronze! What’s the point, then?”   Iron, unlike the other metals listed so far in the series, is widely available. As opposed to bronze which, remember, needed tin and thus trade lines. Iron has another key property. Mixed with the right amount of carbon, we get steel – stronger, lighter and less corrosive. Since carbon was part of the fuel (wood, coal) used in furnaces, so the chances of stumbling upon steel was reasonable.   Iron and steel “turbocharged” everything bronze had been doing: (1) Tools to clear forests and increase a...

The caste census. Not to be confused with the population census. The last caste census was conducted in 1931 under British rule. If it wasn’t conducted for almost a century, why is it being conducted again now?   Advocates for it say it is necessary to know the right numbers to serve as the basis for upliftment schemes and reservations. Opponents say it would only entrench the caste-based identity even further; that it would foment sub-divisions within caste as each group tries to grab a bigger share of the scheme/reservation pie.   Anand Teltumbde wrote a book on the topic titled The Caste Con Census . I haven’t read it and have only read Pranay Kotasthane’s review of the book . Kotasthane says he read the book because the author is a “data science professor, a Marxist”. In other words, a person who understands data and how it can be used, and with a worldview that most of us (Kotasthane included) do not subscribe to. Always good to read the views of someone you do...

After the Copper Age came the Bronze Age. Again, it was a “mix (of) history, geography, physics, geology, and chemistry”, explains Tomas Pueyo in his post . But we are getting ahead of ourselves. First mankind had to find tin and lead.     Why those two? Again, from chemistry, same column (group) = similar chemical properties. In this case: “Because you can make them in a normal fire pit!” Lead melts at 327° C. A wood fire easily reaches 600-800° C. If the ore of lead found itself in a pit fire, the lead got separated. “But lead is not very useful because it’s heavy and way too soft. It couldn’t work as a tool or as a hand-held weapon.” The common ore of lead, galena, has traces of silver. It is likely that humans began to smelt galena for the silver and lead was just a byproduct. ~~   Tin has an even lower melting point of 232° C. But it is brittle and rare, hardly a candidate for a useful metal. But in many copper mines, tin is also present. And c...

Last December, the chaos and flight disruptions created by IndiGo were enormous and terrible. The penalty imposed on them was a paltry ₹22 crore (no prizes for guessing what must have transpired behind the scenes).   The root cause identified by the DGCA (Directorate General for Civil Aviation) though did make sense: “an overriding focus on maximising utilisation of crew, aircraft, and network resources”. Such an (over)emphasis then “significantly reduced roster buffer margins” and “adversely impacted operational resilience”.   But, while the above reason is valid, it wasn’t complete. IndiGo had clearly assumed the new regulations (on rest hours between flights) would not be enforced by the government and therefore had not prepared to meet them (by reducing flights or hiring more pilots/crew). And why did they make that assumption? Because they held a 65% market share, and they assumed that if they couldn’t/wouldn’t meet the new regulations, well, surely the governmen...

Tomas Pueyo wrote this excellent post on how metals shaped human civilization. A “mix of history, geography, physics, geology, and chemistry”, as he calls it. The first 3 metals used by humans were… he points to the Periodic Table!   Gold, silver and copper. Why those three? Because, to recap chemistry, same column (group) = similar chemical properties. The similar property of relevance here is that they can all be found in “native” form, i.e., pure form. ~~   When rocks erode, the heavier and inert gold gets left behind, which is why we found gold first. Gold was valuable because it is rare, malleable, doesn’t oxidize, found in nuggets, and yes, shiny. All those characteristics meant it became a store of value. But it was too heavy, too malleable, so it was of no use to make tools.   Silver is more common than gold. But it tarnishes (it reacts with other things). Which is why it is harder to find in native form. Again, not of much practical use.   ...

In an earlier blog , we saw how a coin tester was responsible for the “discovery” of Ashoka. The story we know today goes like this. Conquers Kalinga in a brutal war. Experiences extreme remorse. Converts to Buddhism. Spends the rest of his rule in positive acts of governance.   But is that what really happened? Devansh Malik explores the question. One , Ashoka lived 2,300 years ago and there are very few sources of info. Two , those famous inscriptions on rocks and pillars, well, Ashoka got them done, so can we be sure that they weren’t just “ancient press releases - public messages carefully crafted to shape his image”? Three , Buddhist descriptions of him were written centuries later, so how accurate were they?   To make matters worse, the different sources don’t always agree. In fact, they often flat out contradict each other! One thing they do agree on is that as a prince, Ashoka was very capable at administration and at military strategy. But he wasn’t the favou...