On 14 September 1949, the Constituent Assembly adopted the Munshi-Ayyangar formula, designating Hindi as the 'official language of the Union' rather than a national language — a compromise now commemorated annually as Hindi Diwas.

• The Munshi-Ayyangar formula (named for K M Munshi and N Gopalaswamy Ayyangar of the Drafting Committee, chaired by B R Ambedkar) was approved in 1950 and incorporated as Articles 343–351 in Part XVII of the Constitution.
• English was permitted for all official purposes for 15 years after the Constitution's commencement — a transition period, not a permanent arrangement.
• The Constitution additionally recognised 14 other languages for official use, listed in the Eighth Schedule; provincial governments could choose a regional language or English for internal affairs, with English retained for inter-provincial communication.

When the 15-year period lapsed in 1965, Hindi was still not widely used in government business. Violent agitation in non-Hindi-speaking states followed, and Parliament backed away from displacing English.

The Official Languages Act, 1963 was subsequently understood to mean English would continue alongside Hindi indefinitely, not merely for a transition.

The outcome is frequently misread in public discourse as a Hindi "victory," since Article 343 names it the Union's official language.

Academic analysis (Sujit Choudhry, cited in the source) instead reads the provisions as a genuine multidimensional compromise: Hindi gained formal primacy on paper, but English retained practical parity, and the Eighth Schedule's protection of other languages — since expanded from 14 to 22 via later amendments — constitutionalised linguistic plurality rather than uniformity.

• Official language vs national language: India's Constitution names an official language of the Union; it does not declare any language "national."
• Eighth Schedule: lists languages given constitutional recognition — 14 originally, 22 today, following the 21st, 71st and 92nd Amendments.
• Three-language formula (1968): the subsequent policy compromise on languages taught in schools, building on the same debate.

The Ministry of Finance has notified that banks and system providers cannot charge for UPI transactions up to ₹2,000 or for RuPay debit card payments, while leaving the door open for a Merchant Discount Rate (MDR) on larger person-to-merchant UPI transactions.

Zero-MDR has been credited with driving UPI's mass adoption, but payment-industry players have long argued it is fiscally unsustainable for banks and payment-service providers who bear infrastructure costs without fee income.

Reintroducing MDR only above ₹2,000 attempts a middle path — preserving free access for small, high-frequency retail payments while allowing cost recovery on higher-value merchant transactions.

The risk is that any eventual MDR gets passed through to merchants or consumers, or nudges larger transactions back toward cards or cash.

• MDR (Merchant Discount Rate): the fee a merchant pays their bank/payment provider for processing a digital payment.
• NPCI: National Payments Corporation of India, the umbrella organisation operating UPI, RuPay and other retail payment systems.
• Section 269SU, Income Tax Act, 1961: mandates specified large businesses to offer prescribed low-cost digital payment modes to customers.

Scientists at the Physical Research Laboratory (PRL), Ahmedabad, have confirmed a previously undetected lunar impact basin — the Australe Basin — using mineralogical data from Chandrayaan-1, and suggest it could predate the Moon's currently oldest known basin.

• The Australe Basin, in the Moon's southeastern hemisphere, had escaped detection because erosion along its rims made it hard to identify even with modern imaging — it was confirmed instead through distinct mineralogical and gravity signatures.
• Its basalts are unusually low in calcium and high in magnesium, unlike most lunar basalts, and sit within a province of 248 small, circular basalt ponds rather than the smooth lava plains typical of known basins.
• PRL scientists believe the basin could be older than the South Pole-Aitken Basin (researchers' inference, not yet definitively settled).

Figure 3 — The lunar South Polar region

Base image: south-polar mosaic of the Moon showing the South Pole–Aitken (SPA) Basin and the South Pole/Shackleton crater rim; reproduced with credit for educational use. Australe Basin and Shiv Shakti Point are marked by Legacy IAS from published coordinates; the mosaic is not a precision georeferenced map, so the Australe Basin mark shows approximate direction only, not an exact boundary.

The finding refines the chronology of the Moon's earliest bombardment history and offers a framework for interpreting data from planned South Polar missions, including NASA's proposed Moon Base and India's Chandrayaan-4 lunar sample-return mission.

• PRL, Ahmedabad: premier Indian space and planetary sciences research institute.
• Shiv Shakti Point: the official name of the Chandrayaan-3 landing site (2023) in the lunar South Polar region.
• Impact basin vs crater: basins are exceptionally large, multi-ring craters, often hundreds of kilometres across.

A team led by Urbasi Sinha at the Raman Research Institute (RRI), Bengaluru, has shown that a single, precisely timed operation — rather than repeated corrective interventions — can delay quantum decoherence and avoid "entanglement sudden death."

• A carefully timed "single-shot operation" can, depending on when it is applied, either delay decoherence and avoid sudden death, or (undesirably) hasten decoherence — showing that timing itself is a control resource, alongside materials, gates and error-correction protocols.
• The team describes this as a proof of concept, not a complete solution, requiring testing across different quantum computing platforms. Results are published in the American Physical Society's Physical Review A.

The researchers explicitly do not claim to have solved decoherence or replaced quantum error correction; the result adds one new lever rather than a fix.

Translating a single-platform proof of concept into a generalisable technique for fault-tolerant quantum computers remains a separate, longer engineering challenge, relevant to India's efforts under the National Quantum Mission.

• Raman Research Institute (RRI), Bengaluru: autonomous research institute specialising in physics, including quantum optics and quantum information.
• National Quantum Mission (2023): India's mission-mode programme for quantum computing, communication, sensing and materials, approved with an outlay of ₹6,003.65 crore.

BirdLife International's latest State of the World's Birds report — its first edition devoted to flyways — finds that 45% of migratory bird species are declining and one in nine faces extinction, even as a newly signed declaration commits governments and financiers to cross-border conservation.

• Declines stem from well-understood, human-caused pressures: invasive species, agricultural intensification, climate change and unsustainable hunting; seabirds and shorebirds are worst affected.
• Coordinated, whole-flyway action can reverse trends: multi-country intervention for the Egyptian Vulture has halted the decline of its Balkan breeding population.

Signed by governments, scientists, NGOs and financial institutions, the declaration commits signatories to cross-border, flyway-scale cooperation, alongside over $6 billion in conservation finance mobilised by development banks since 2021.

The report frames the causes of decline as "well-understood," implying the binding constraint is coordination and finance rather than science — but the Declaration itself is a non-binding political commitment, not a treaty.

Its record will depend on implementation, much like the CMS Gandhinagar Declaration (2020), adopted when India hosted CMS COP13. Notably, India sits on the Central Asian Flyway, which — unlike the African-Eurasian Waterbird Agreement or the East Asian-Australasian Flyway Partnership — still lacks a binding multilateral instrument, a recurring Prelims/Mains gap.

• CMS (Convention on Migratory Species / Bonn Convention): UN treaty on conserving migratory species; India ratified it in 1983 and hosted COP13 in Gandhinagar (2020).
• Central Asian Flyway (CAF): the migratory bird corridor covering India, lacking a binding cooperative framework unlike some other flyways.