2026 Nobel Prize in Physiology or Medicine

GS  III Science and technology

Why in News?

The 2026 Nobel Prize in Physiology or Medicine was awarded to Karl Deisseroth, Peter Hegemann and Georg Nagel for discoveries related to lightgated ion channels and optogenetics, which enabled scientists to control the activity of specific cells using light.

Channel rhodopsins

• Light sensitive membrane proteins that function as light gated ion channels.
• Originally identified in green algae.
• Respond to specific wavelengths of light by opening ion channels in the cell membrane.
• Ion movement changes the cell''s membrane potential and electrical activity.
• They provide the molecular basis for using light to control electrically active cells such as neurons.

Simple Analogy

• Channel rhodopsin = Light controlled electrical switch
• Light OFF → Channel closed → No light induced ion flow
• Light ON → Channel opens → Ion flow → Electrical activity changes

What is Optogenetics?

• Optogenetics combines: Genetic engineering + Light
• It involves introducing genes encoding light sensitive proteins (opsins) into selected cells, particularly neurons, so that their activity can subsequently be controlled using light.

How Opto genetics Works

• Target neurons selected : Scientists identify the particular neurons or neural circuit they want to study.
• Opsin gene introduced : A gene encoding a light sensitive protein such as channel rhodopsin is delivered to the target neurons, often using a viral vector.
• Opsin expression : The modified neurons produce the lightsensitive protein in their cell membranes.
• Light delivered : A specific wavelength of light is directed onto the target neurons, commonly through an optical fibre or other specialised system.
• Ion channels respond : Light activates the opsin, causing the lightgated channel to open or otherwise alter ion movement across the membrane.
• Neuronal activity changes : The resulting change in membrane potential can activate or inhibit neural activity, depending on the opsin used.
• Behavioural response observed : Researchers observe changes in movement, memory, reward, mood or other behaviours.

Nobel Contributions

• Peter Hegemann: Key discoveries concerning microbial opsins/channel rhodopsins and their light sensitive properties.
• Georg Nagel: Helped establish the functional properties of microbial opsins as light gated ion channels.
• Karl Deisseroth: Pioneered the development and application of optogenetics for controlling and studying neural circuits.

Significance

• Causal understanding of the brain: Optogenetics allows researchers not merely to observe neuronal activity but to manipulate specific neurons and examine the resulting effects.
• High precision: It provides precise control over selected cells and neural circuits in terms of location and timing.
• Brain–behaviour relationship: It helps establish cause and effect relationships between neuronal activity and behaviour.
• Biomedical research: It provides a powerful tool for understanding the neural basis of neurological and psychiatric disorders.

Black Sea - Strategic Maritime Gateway of Europe and Eurasia

GS I: Physical geography| GS II: International Relations

Why in News?

A commercial cargo vessel carrying Ukrainian grain sank in the Black Sea after reportedly being struck by Russian drones, highlighting the region’s importance for maritime security, geopolitics and global grain trade.

Location

• Located between Eastern Europe and Western Asia.
• Lies at the intersection of Europe, the Caucasus and Anatolia.
• Connected to the Mediterranean Sea through the Turkish Straits.
• Provides a strategic maritime link between Eastern Europe, the Caucasus and the Mediterranean.

Littoral Countries — BURGERT

B — Bulgaria

U — Ukraine

R — Russia

G — Georgia

R — Romania

T — Türkiye

Important Waterway Connections

• Bosporus: Connects the Black Sea and Sea of Marmara.
• Dardanelles: Connects the Sea of Marmara and Aegean Sea.
• Turkish Straits: Collectively, the Bosporus and Dardanelles provide the maritime gateway between the Black Sea and Mediterranean.

Black Sea → Sea of Azov

• Black Sea → Kerch Strait → Sea of Azov
• Kerch Strait connects the Black Sea with the Sea of Azov.
• It lies between the Crimean Peninsula and Taman Peninsula.

Major rivers draining into the Black Sea system include:

• Danube
• Dnieper
• Dniester
• Don

Important: The Don River flows into the Sea of Azov, which is connected to the Black Sea through the Kerch Strait.

Geographical Features

Anoxic Deep Waters

• Deep waters of the Black Sea are largely oxygen deficient (anoxic).
• This is associated with restricted water exchange, stratification and limited deep water circulation.
• It makes the Black Sea geographically distinctive among the world’s semi enclosed seas.

Major Grain Corridor

• The Black Sea is a major maritime corridor for agricultural exports, particularly wheat, maize and other grains from Russia and Ukraine.
• Disruption of shipping can therefore affect global food supply and commodity prices.

Strategic Maritime Location

• The Black Sea connects the wider regions of: Eastern Europe ↔ Caucasus ↔ Mediterranean
• Its location makes it important for trade, energy routes, naval strategy and regional security.

Strategic Significance

• Global Food Security : Disruptions to Black Sea shipping can reduce grain availability in international markets and increase foodprice volatility, particularly for import dependent countries.
• Geopolitical Significance : The region is strategically important because of its proximity to Russia, Ukraine, NATO members and the Caucasus.
• Maritime Connectivity : The Turkish Straits provide the principal maritime route between the Black Sea and Mediterranean, making Türkiye strategically important for regional shipping and naval access.
• Energy Security : The wider Black Sea region is relevant to oil and gas transportation and regional energy connectivity, adding another layer to its geopolitical importance.

Montreux Convention, 1936

The Montreux Convention Regarding the Regime of the Straits regulates navigation through the Turkish Straits.

It is particularly significant for:

• Passage of warships between the Mediterranean and Black Sea.
• Balancing the interests of Black Sea littoral states and other maritime powers.
• Regulating the movement of naval vessels through the strategically important Turkish Straits.

Exercise Mountain Guardian 2026

GS  III Defence Exercise

Why in News?

The inaugural India–UAE Exercise Mountain Guardian 2026 commenced at Chaubatia, Uttarakhand, marking a new dimension in bilateral military cooperation focused on mountain warfare and high altitude operations.

About

• Participants: India and UAE
• Type: Bilateral Army exercise
• Edition: Inaugural
• Location: Chaubatia, Uttarakhand
• Focus: Mountain warfare and joint field operations

 Key activities:

• Rock climbing
• Rappelling
• Combat shooting
• Drone based surveillance
• Counterterrorism operations
• Field and tactical training

India’s Rising Supercomputing Ecosystem

GS  III — Science & Technology

Why in News?

India has deployed 40 indigenous supercomputers with a combined capacity of 68 Petaflops under the National Supercomputing Mission (NSM), expanding its domestic HighPerformance Computing (HPC) ecosystem.

Notes

• National Supercomputing Mission (NSM): Launched in 2015.
• Nodal Ministries: Department of Science & Technology (DST) and Ministry of Electronics and Information Technology (MeitY).
• Implementation: Centre for Development of Advanced Computing (CDAC) and Indian Institute of Science (IISc).
• First indigenous Indian supercomputer: PARAM 8000 (1991).
• PARAM series: India''s indigenous supercomputing programme.
• PARAM Rudra: Latest generation of indigenous supercomputers developed under the NSM.
• National Knowledge Network (NKN): Provides highspeed connectivity among research and academic institutions.
• Petaflop: 10¹⁵ floatingpoint operations per second.
• HPC: Uses largescale parallel processing to perform computationally intensive tasks.

Aim

• Build compute sovereignty and reduce dependence on imported HPC infrastructure.
• Develop indigenous hardware, software, applications and skilled manpower.
• Strengthen scientific research and technological innovation.
• Provide advanced computing facilities to academia, industry and strategic sectors.

Significance

• Supercomputing is increasingly becoming critical technological infrastructure, underpinning AI, climate science, healthcare, defence, space research, advanced manufacturing and energy security.
• For India, indigenous HPC capability is therefore an important component of technological sovereignty and strategic autonomy.

Challenges

• Hardware Dependence:Continued dependence on imported CPUs, GPUs and advanced semiconductor components limits complete technological autonomy.
• Energy Intensity: Supercomputers require substantial electricity and sophisticated cooling systems.
• Software Ecosystem: Dependence on proprietary computing architectures and software can create technological lockin.
• Limited PrivateSector Utilisation: Greater participation from startups, MSMEs and private R&D institutions is needed.
• Global Technology Gap: India needs greater computing capacity and indigenous technology to compete with leading global HPC ecosystems.

India-Specific Severity Score for Sickle Cell Anaemia

GS II – Health | GS III – Biotechnology & Genetics

Why in News?

CSIR–Centre for Cellular and Molecular Biology (CCMB) has developed an India-specific severity score to predict the clinical severity of sickle cell anaemia.

What is the Severity Score?

• Categorises patients according to disease severity, helping doctors identify mild, moderate and severe cases.
• Designed around the Indian population, where genetic and clinical characteristics can differ from those observed in Western populations.
• Can support risk stratification and personalised treatment decisions.
• Particularly useful where extensive diagnostic facilities are limited.

Significance for India

• India has a significant burden of sickle cell disease, with a particularly high prevalence among several tribal communities.
• The National Sickle Cell Anaemia Elimination Mission (NSCAEM) aims to screen 7 crore people, with a focus on tribal and high-prevalence populations, and seeks to eliminate sickle cell disease as a public-health problem by 2047.

India–Switzerland Relations: From Finance to Innovation

GS  II — International Relations

Why in News?

India and Switzerland announced five cooperation instruments during Swiss President Guy Parmelin’s state visit to India, coinciding with the first anniversary of the India–EFTA Trade and Economic Partnership Agreement (TEPA).

Notes

• Diplomatic relations: Established in 1948.
• Switzerland: Member of the European Free Trade Association (EFTA) along with Norway, Iceland and Liechtenstein.
• India–EFTA TEPA: Entered into force on 1 October 2025.
• Automatic Exchange of Information (AEOI): India–Switzerland framework became operational in 2018.
• Switzerland is an important source of investment, technology and expertise for India.

Five Cooperation Instruments

• Migration and Mobility Partnership (MMP)
• India: Ministry of External Affairs (MEA) / relevant authorities
• Switzerland: State Secretariat for Migration (SEM)
• Promotes safe, orderly and regular migration, skilled mobility and cooperation against irregular migration and human trafficking.

Young Professionals Exchange

• India: Ministry of External Affairs / relevant authorities
• Switzerland: State Secretariat for Migration (SEM)
• Facilitates professional exposure and international work experience for young professionals.

Sustainable Transport and Mobility

• India: Ministry of Road Transport & Highways (MoRTH)
• Switzerland: Federal Department of Economic Affairs, Education and Research (EAER)
• Promotes cooperation in sustainable, efficient and lowcarbon transport and mobility.

Research Cooperation

• India: Department of Science & Technology (DST)
• Switzerland: Swiss National Science Foundation (SNSF)
• Strengthens joint scientific research, innovation and emerging technology cooperation.

IndoSwiss Academia–Industry Training (AIT) Programme

• India: Department of Science & Technology (DST)
• Switzerland: Zurich University of Applied Sciences (ZHAW)
• Promotes industry oriented training, innovation, technology transfer and entrepreneurship.

Maiden International Shipment from Bogi beel

 GS III Infrastructure

Why in News?

The first international cargo shipment from Upper Assam since Independence was launched from Bogi beel Terminal, carrying 540 MT of methanol to Bangladesh.

Pointers

• River: Brahmaputra
• National Waterway: NW2
• NW2: Sadiya–Dhubri stretch of the Brahmaputra in Assam.
• Cargo: Methanol
• Quantity: 540 MT
• Producer: Assam Petro Chemicals Limited
• Destination: Pangaon Port/ICD, near Dhaka, Bangladesh.
• International route: Indo Bangladesh Protocol on Inland Water Transit and Trade (PIWTT) route.

National Waterway2

• NW2 = Brahmaputra River
• It provides an inland waterway corridor through Assam and connects the Northeast with the Indo Bangladesh inland water transit network.

Significance

• Revival of river trade: Reconnects Assam with its historic riverbased commercial networks.
• Lower logistics costs: Waterways can transport large quantities of cargo with relatively lower fuel consumption and transport costs.
• Decongestion: Greater use of inland waterways can reduce dependence on road transport and associated congestion.
• India–Bangladesh connectivity: Strengthens crossborder inland water transport and trade.
• Northeast integration: Creates an additional economic corridor connecting the Northeast with Bangladesh and the wider Bay of Bengal region.
• Act East Policy: Better connectivity with Bangladesh can facilitate India''s broader engagement with Southeast Asia.

National Household Travel Survey

GS II Governance

Why in News?

The National Statistical Office (NSO), Ministry of Statistics and Programme Implementation (MoSPI) released findings from India’s first National Household Travel Survey, covering the period July 2025–June 2026.

Pointers

• Conducted by: National Statistical Office (NSO), MoSPI.
• Survey period: July 2025–June 2026.
• Households covered: 4.92 lakh.
• Persons covered: 20.34 lakh+.
• Travel threshold: Trips of 1 km or more were counted.
• Purpose: To generate comprehensive data on household and individual travel behaviour and mobility patterns.

Important Findings

Educational Travel

• 66.4% of students travelled 1 km or more to educational institutions.
• Walking was the largest mode of travel among students.

Work Related Travel

• 57.6% of workers travelled 1 km or more to their workplace.
• Two wheelers were the dominant mode for work related travel.
• Male workforce mobility was significantly higher than female workforce mobility.

Overnight Travel

• Buses and railways were major modes for overnight travel.
• Social and religious purposes accounted for a significant share of overnight trips.

The survey provides evidence for understanding:

• Urban and rural mobility patterns
• Public transport demand
• Gender differences in mobility
• Transport infrastructure planning
• Accessibility to education and employment
• Regional mobility and connectivity

Significance

• Mobility patterns: Provides evidence on how people travel for education, work and other purposes across rural and urban areas.
• Public transport planning: Helps assess demand for buses, railways and other shared transport systems.
• Gender mobility: Highlights differences in male and female access to workplaces, education and transport.
• Infrastructure planning: Supports evidencebased planning of roads, public transport and connectivity infrastructure.
• Access to opportunities: Shows the extent to which distance and transport availability affect access to education and employment.
• Regional connectivity: Helps identify spatial mobility gaps and areas requiring improved transport connectivity.

Petroglyphs in Kerala

GS I Art and Culture

 Why in News?

Petroglyphs were discovered near the megalithic umbrella stone site at PeralamKozhummal in Kannur district, Kerala.

What are Petroglyphs?

• Petroglyph → Image, symbol or design carved, pecked, engraved or incised into a rock surface.
• Pictograph → Image or symbol painted/drawn onto a rock surface.
• Thus: Petroglyph = engraved/carved; Pictograph = painted.

Peralam Kozhummal — Kannur

• Associated with a megalithic umbrella stone.
• Petroglyph discovery adds another dimension to Kerala''s prehistoric rock art record.

Other Kerala rock art locations:

• Ettukudukka
• Ariyittapara

Important Indian Petroglyph Sites

Pneumonic Plague

 GS III Science and Technology

Why in News?

A suspected case of pneumonic plague in Siberia led to quarantine and monitoring of close contacts.

Pointers

Causative organism: Yersinia pestis — a Gram-negative bacterium.

Three Major Forms of Plague

Pneumonic Plague

• May occur primarily through inhalation of infectious droplets or secondarily when plague spreads to the lungs from another form.
• Can spread person-to-person through respiratory droplets.
• It is the most rapidly progressive form of plague.
• Can cause severe pneumonia, respiratory distress and systemic infection.
• Requires prompt antibiotic treatment.
• Suspected cases require appropriate infection-control measures and isolation to prevent transmission.

Transmission

• Bubonic plague: Usually associated with transmission through the bite of an infected flea.
• Pneumonic plague: Can spread directly between people through respiratory droplets.

Sal Heartwood Borer

GS III - Environment

Why in News?

The Ministry of Environment, Forest and Climate Change (MoEFCC) approved the felling of around 1.47 lakh sal trees infested by the Sal heartwood borer in Dindori district, Madhya Pradesh, as a measure to control the infestation.

Key Facts

• Sal tree - Shorea robusta
• Sal heartwood borer - Hoplocerambyx spinicornis
• It is a wood-boring beetle.
• The pest attacks sal trees, particularly affecting their timber and potentially weakening/damaging affected trees.
• Severe infestation can result in mortality of trees and economic loss to sal forests.

Why is it Important?

Sal is an important forest species of central and northern India.

Large-scale infestation can affect:

• Forest productivity
• Timber value
• Forest regeneration
• Local forest-dependent communities
• Pest outbreaks therefore have both ecological and economic implications.

Control Measures

Trap Trees

• Selected trees are used as trap trees to attract the beetles.
• Infested/trapped material is subsequently removed and destroyed as prescribed.

Sanitation Felling

• Removal of infested and severely affected trees to reduce the pest population and prevent further spread.

Removal of Infested Material

• Infested logs, branches and other breeding material are removed from the forest.

Uranium Corporation of India Ltd. (UCIL)

GS III – Science & Technology

 Why in News?

Uranium Corporation of India Limited (UCIL) entered its Diamond Jubilee Year in 2026, marking 60 years of its establishment.

Key Facts

• Established: 1967
• Type: Public Sector Enterprise
• Administrative control: Department of Atomic Energy (DAE)
• Headquarters: Jaduguda, Jharkhand
• Core activity: Uranium mining and processing
• Plays an important role in supplying uranium for India''s nuclear power programme.

Major Uranium Mining Areas

Important UCIL operations are concentrated particularly in Jharkhand, including:

• Jaduguda
• Bhatin
• Narwapahar
• Turamdih
• Bagjata

Nuclear Fuel Cycle

The nuclear fuel cycle refers to the sequence of processes involved in obtaining, preparing, using and managing nuclear fuel for electricity generation.

Front End — Preparing Nuclear Fuel

Uranium mining → Milling → Conversion → Enrichment → Fuel fabrication

• Mining: Uranium ore is extracted.
• Milling: Ore is processed into yellowcake (U₃O₈).
• Conversion: Uranium is converted into a suitable chemical form, commonly UF₆ for enrichment.
• Enrichment: Proportion of U235 is increased for reactors that require enriched fuel.
• Fuel fabrication: Enriched uranium is converted into fuel pellets, which are assembled into fuel rods.

Reactor Stage

Fuel loading → Nuclear fission → Heat → Steam → Electricity

• Fuel undergoes controlled nuclear fission inside the reactor.
• Fission releases heat, which is used to generate electricity.
• Spent fuel is removed after its useful reactor life.

Back End — Spent Fuel Management

Spent fuel → Storage → Reprocessing OR Direct disposal

• Interim storage: Spent fuel is safely stored while its heat and radioactivity decline.
• Reprocessing: Useful materials such as uranium and plutonium can be recovered and reused.
• Waste management: High level radioactive waste requires long term isolation and disposal.

White House Accord on Super Intelligence

GS III – Science & Technology

Why in News?

The U.S. White House announced the “White House Accord on Super Intelligence: Joint Commitment on Frontier Responsibilities”, under which major AI companies voluntarily committed to strengthening safety controls and oversight for their most advanced frontier AI models.

What does the Accord propose?

It establishes four layers of safety controls and audits:

Internal controls  : monitor frontier models for risks involving:

• Cybersecurity
• Biosecurity
• Chemical threats
• Unintended access/hacking of technical systems.

Internal oversight team :  verify that safety controls work and ensure identified problems are addressed.

Independent external auditor/evaluator :  conduct independent assessments of the safety controls.

Independent board committee :  provide board-level oversight and receive reports from internal and external reviewers.

Key Participants

• Google, Anthropic,  Meta, OpenAI, xAI , Nvidia
• The participating companies also agreed to meet regularly to develop common standards and best practices for frontier AI safety.