UPSC Science and Technology

To carve Kailasa from the top down out of a single volcanic mass, the ancient Sthapatis (master engineers) had to solve problems that modern CAD software handles today. Before a single chisel touched the stone, the entire multi-story complex including its internal rooms, floating balconies, drainage systems & columns had to be mathematically mapped out in 3Ds. In a traditional building, if a room is misaligned, we can tear down a wall & rebuild it. In rock-cut monolithic architecture, we cannot put back rock that has been carved away. A single 5" calculation error on the roof would cause a column on the 3rd floor below to completely miss its load-bearing alignment, collapsing the ceiling. The then engineers used a highly sophisticated system of geometric grids based on micro-measurements (Angula & Hasta). They used a technique called Volumetric Prototyping. They modeled the mountain as a massive 3D coordinate matrix (X, Y, Z axes), translating a highly advanced, non-surviving theoretical blueprint seamlessly onto the undulating, uneven surface of a natural cliffside. Carving 400000 tons of basalt, hardened volcanic lava rich in silica & iron cannot be done by simply swinging ordinary iron tools. The tools would blunt/deform/break within mins. The construction period correlates with India's absolute peak in Wootz steel production. This was a form of nanotech where iron was smelted with specific carbon-rich organic materials in sealed crucibles, creating a matrix of ultra-hard iron carbides (cementite). Now to move 100s of 1000s of tons of rock rapidly w/o modern explosives, they likely used controlled thermal stress. By heating targeted fracture lines along the basalt's natural crystalline planes using massive, localized fires & then instantly dousing them with cold water, they forced the rock to cleanly shear itself apart along flat planes. This is a highly calculated application of thermodynamics. In ancient India, advanced scientific & engineering knowledge was not published in open-source public libraries. It was fiercely guarded within highly specialized, hereditary engineering guilds (Shrenis/Vishwakarmas). Knowledge was passed down from master to apprentice via encrypted architectural texts (Vastu Shastras) & oral mathematical mnemonics. This kept the IP secure from foreign theft, but it made the entire scientific system highly vulnerable to a SPOF. If a single elite guild of master builders was wiped out in a war, the complex mathematical formulas for calculating rock stress & monolithic geometric projections died with them instantly.

Kailasa Temple credit : chapterofdesign

India is the world's largest cotton producer. Yet, it clothes its delivery riders in polyester and pays its manufacturers to make more of it. This is the story of a colonial dress code India never went away and is now even being subsidised. In April 2025, 150 delivery riders walked off their jobs in Varanasi. One demand stood out — cotton uniforms. "This uniform is made of polyester, it is impossible to be comfortable wearing it in summer," one rider told a reporter. The company's response was to block 150 IDs. Beyond the strike, the science of the fabric is brutal. Red polyester absorbs nearly 3x the solar radiation of white cotton. India lost 247 billion labour hours to extreme heat in 2024 — the highest figure in the world that year. The fabric is a part of this heat load Every June, the US Senate holds National Seersucker Day. Senators wear a lightweight puckered cotton — originally Indian working cloth — because it's the only thing that gets you through a summer day comfortably. And the Indian delivery rider, that same month, wears polyester. The Philippines was once forced by Spanish colonisers to wear the barong tagalog as a mark of lower status. They reclaimed it. And today, it is worn by judges, cabinet ministers and fast-food cashiers alike. India had the same colonial pressure but made the opposite choice. But it’s not as if “evil corporates” deliberately set out to harm delivery riders. To them its economics. Polyester cost about a dollar per kilogram less than cotton, and they chose the cheaper fabric. The rashes that followed are then blamed on weather, not policy. And the government? India's PLI scheme for textiles — worth ₹10,683 crore — explicitly targets man-made fibre apparel. World's largest cotton producing country is putting its biggest textile subsidy into petroleum-derived fabric. Indonesia, the Philippines, Malaysia, Bhutan, and the Gulf all kept their indigenous climate dress codes. The Charaka Samhita divided the Indian year into six seasons and prescribed thin cotton for the hot months. So, India had figured it 2,000 years ago, but abandoned it. The official Wimbledon towel — used by Federer, Nadal, Djokovic — is woven in Vapi, Gujarat, in 100% cotton. It is made in India for the world's most prestigious tennis court while the rider who can't get a cotton shirt lives on the next street.

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How do you stop exam paper leaks? A tech- based reform required. Under the leadership of DGP,Haryana, Sh. Ajay Singhal — an innovator and reformer in policing — Haryana Police rebuilt the B1 promotion exam from scratch. Zero paper. Zero human contact. Zero leaks. Between 2018-2024: 7 exams | 34,278 constables appeared | 14,000 unique question papers | Each candidate got a different set of 140 Qs | Instant email results | CCTV + biometric + firewalls. Result: Zero cheating. Zero litigation. First police force in India to do this. “Every leaked paper is a letter of rejection to fairness.” - DGP Ajay Singhal When will, planning & technology combine, trust is restored. This is how you dismantle the exam mafia. -Shared by Haryana Police

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STUNNING: Extremely Rare Red Sprites Spotted Flashing Over Tibet They are caused by high levels of electrical activity and form in the upper atmosphere during powerful thunderstorms.

How many men and women are overweight in India? As per the National Family Health Survey-6 (2023-24) released by the Health Ministry, 42.8% women (aged 15-49 years) are obese or overweight in urban areas while 25.5% are overweight in rural areas, taking the total to 30.7%. Meanwhile, 36.3% men (aged 15-49 years) are overweight in urban areas compared to 23% in rural areas, taking the total to 27.3%.

Wonderful Lecture on ANSWER WRITING: https://www.youtube.com/live/ReHV5RcAys8?si=FEPtS9cb-EEQ0BWu

During the world war, the Allies mapped bullet holes on planes that returned from missions. The instinct was simple: reinforce the areas most damaged. More armour. More steel. More money. But mathematician Abraham Wald saw what others didn’t. “These are the planes that survived,” he said. The real danger lay in the places without bullet holes because those were the hits that caused the planes not to return. That insight became known as survivorship bias. It’s not just about planes, it’s about everything we think we know.

survivorship bias

Dopamine fasting: Man does a "dopamine fast" for 45 minutes daily with the goal of reducing anxiety.

SOMP cutoff prediction for CSE 2026: 73+_2 marks. All the best.