The Bharatiya Nagarik Suraksha Sanhita (BNSS), 2023 replaced the Code of Criminal Procedure (CrPC), 1973, which itself replaced the Code of Criminal Procedure, 1898 — the colonial-era law that governed criminal procedure in British India.

The BNSS came into force on 1 July 2024, alongside the Bharatiya Nyaya Sanhita (BNS, replacing IPC 1860) and the Bharatiya Sakshya Adhiniyam (BSA, replacing Indian Evidence Act 1872).

• Section 173(1) BNSS: The operative provision for the e-Zero FIR system. It mandates that information relating to the commission of a cognisable offence — irrespective of where the offence is committed — may be given orally or through electronic communication to the officer in charge of a police station. This digitises the First Information Report process and enables cross-jurisdictional reporting — previously a major barrier for cyber fraud victims.
• Zero FIR — what it is: A Zero FIR is an FIR that can be filed at any police station regardless of where the offence occurred — without jurisdiction limitations. Once filed, it is transferred to the station with actual territorial jurisdiction for investigation. The concept pre-dates BNSS; it was recommended after the Nirbhaya case (2012) by the Justice Verma Committee to ensure no victim is turned away on jurisdictional grounds.
• Cognisable offence: An offence for which the police may arrest without a warrant and begin investigation without magisterial sanction. Cyber financial fraud above threshold amounts is classified as a cognisable offence — making it eligible for FIR registration rather than merely a complaint.
• National Cyber Crime Reporting Portal (NCRP) and Helpline 1930: NCRP (cybercrime.gov.in) is the Central platform for reporting all types of cybercrime. Helpline 1930 is the dedicated cyber fraud financial response line — designed to enable rapid freezing of fraudulently transferred funds before they are withdrawn. Both are MHA initiatives under the Indian Cyber Crime Coordination Centre (I4C).

Modern International Relations as an academic discipline emerged in the aftermath of the First World War, with the establishment of the first Chair in IR at Aberystwyth, Wales in 1919. The discipline has been shaped primarily by Western — and specifically American — intellectual traditions, a point made by Stanley Hoffman who famously described IR as "an American Social Science."

• Classical Realism (Hans Morgenthau, 1948): In Politics Among Nations, Morgenthau argued that the international system is anarchic (no central authority above states) and that states are compelled to pursue national interest defined in terms of power. Realism became the dominant framework for Cold War-era foreign policy analysis and continues to shape mainstream commentary.
• Neorealism / Structural Realism (Kenneth Waltz, 1979): In Theory of International Politics, Waltz shifted focus from human nature (Morgenthau) to the structure of the international system — arguing that anarchy itself (not the nature of states or leaders) drives security competition. This framework underpins much contemporary security analysis.
• Liberalism in IR: Associated with Woodrow Wilson's 14 Points (1918), the League of Nations project and the post-1945 liberal international order (UN Charter, Bretton Woods, GATT/WTO). Argues that international institutions, economic interdependence and democratic norms can overcome the security dilemma and enable cooperation.
• Constructivism: Associated with Alexander Wendt (Anarchy is What States Make of It, 1992) — argues that international structures are socially constructed through shared ideas, identities and norms, not purely material power. This framework is most useful for explaining why states behave differently despite similar material capabilities.
• Non-Aligned Movement (NAM) — an ethical framework: India's co-founding of NAM (Bandung, 1955; Belgrade, 1961, with Nehru, Tito and Nasser) was not merely a strategic hedge against Cold War bipolarity — it was a normative vision: sovereign equality, anti-colonialism, peaceful coexistence, and a call for a more just world order. NAM represented the Global South's first systematic injection of ethics into international order-building.

The most rigorous measure of whether any currency is over- or undervalued is not the bilateral exchange rate (rupee vs. dollar) but its Nominal Effective Exchange Rate (NEER) and Real Effective Exchange Rate (REER) — indices that capture the rupee's movement against a weighted basket of currencies of India's major trade partners.

• NEER (Nominal Effective Exchange Rate): The weighted average of India's bilateral exchange rates against the currencies of its major trading partners, without adjusting for inflation differentials. The RBI calculates NEER against a basket of 40 currencies, weighted by each country's share in India's total foreign trade. Base year: 2015–16 = 100. A declining NEER indicates the rupee has depreciated in nominal terms against the basket.
• REER (Real Effective Exchange Rate): The NEER adjusted for the inflation differential between India and its trading partners. This is the true measure of competitive valuation. If India's domestic inflation runs higher than its trading partners' inflation, the REER rises (the rupee appreciates in real terms even if the nominal rate stays flat), making Indian exports less competitive. Conversely, if the rupee depreciates faster than the inflation differential, the REER falls — indicating real undervaluation and potential export competitiveness gains.
• Analogy with CPI: NEER/REER are constructed similarly to the Consumer Price Index — a weighted average index with a fixed base year, where weights reflect relative importance (trade share for NEER/REER vs. consumption share for CPI).
• The 40-currency basket: Covers countries representing approximately 88% of India's annual trade flows. Major currencies include USD, EUR, CNY, GBP, JPY, AED, SAR — reflecting the geographic concentration of India's trade.
• Overvaluation vs. undervaluation: A REER above 100 (base year) indicates real appreciation — the rupee has become more expensive than its fundamentals justify, reducing export competitiveness. A REER below 100 indicates real depreciation — the rupee has become relatively cheaper, potentially benefiting exporters.

The Western Ghats, running approximately 1,600 km parallel to India's west coast from Gujarat to Tamil Nadu, is one of the world's eight "hottest biodiversity hotspots" as designated by Conservation International.

It is older than the Himalayas — formed during the breakup of Gondwana — and is the source of major peninsular river systems draining both east and west.

• UNESCO World Heritage Site (2012): 39 sites within the Western Ghats were inscribed as a serial World Heritage Site under the criterion of "outstanding universal value" for biodiversity. The inscription covers parts of Kerala, Karnataka, Tamil Nadu and Goa.
• Also known as: Sahyadri (Maharashtra and Goa), Nilgiri Hills (Karnataka–Tamil Nadu–Kerala junction), Anaimalai Hills, Cardamom Hills. The Nilgiris is where the Western Ghats meets the Eastern Ghats.
• Highest peak: Anamudi (2,695 m), Kerala — the highest peak in peninsular India south of the Himalayas.
• Ecological functions: Monsoon barrier (intercepts southwest monsoon, causing orographic rainfall on the western slopes); peninsular watershed (source of Godavari, Krishna, Kaveri flowing east; Periyar, Sharavathi flowing west); Global Biodiversity Hotspot; climate regulator.
• Endemic biodiversity: Over 5,000 species of flowering plants (1,700+ endemic), 139 mammal species, 508 bird species, 179 amphibian species (majority endemic). Key endemic fauna: Lion-tailed Macaque, Nilgiri Tahr, Purple Frog (Nasikabatrachus sahyadrensis — a "living fossil" rediscovered in 2003).
• Ecologically Sensitive Area (ESA) — legal basis: Under Section 3(2)(v) of the Environment (Protection) Act, 1986, the Central Government can designate ESAs and prohibit or restrict industrial and other activities in such areas. ESA notifications are distinct from — and intended to complement — existing protected area designations under the Wildlife (Protection) Act, 1972.

Lead (Pb) is a naturally occurring heavy metal found in deep geological layers. Unlike many pollutants, lead has no known safe level of exposure in humans — any detectable blood lead level carries measurable health risk.

Lead was widely used in paint, fuel (leaded petrol), batteries and plumbing for most of the 20th century; its elimination from petrol (completed in India in 2000 and globally by the early 2000s) was one of the largest-impact public health interventions of the last century.

• Lead's mechanism of harm: Once ingested (through food, water or soil) or inhaled (as aerosol particles), lead enters the bloodstream and accumulates in bones — where it mimics calcium and can remain for decades. In the blood, it impairs kidney function, raises blood pressure and causes cardiovascular disease. In the brain, lead degrades myelin — the protective outer coating of nerve fibres — and disrupts neural connectivity, causing permanent cognitive impairment.
• Children's disproportionate vulnerability: Children absorb 4–5 times more lead from the environment than adults due to higher hand-to-mouth behaviour and greater gut absorption rates. Lead exposure during childhood is linked to: shortened attention spans, heightened aggression, behavioural disorders, and a permanent IQ reduction (estimated at 1–5 IQ points per 10 μg/dL blood lead level). The World Bank estimates childhood lead exposure costs LMICs trillion annually in lost economic productivity.
• Lead-acid batteries — the primary source: Lead-acid batteries (used to start petrol and diesel engines, and in back-up power systems, solar installations and EVs) account for 86% of global lead consumption. They are recyclable, cheap and energy-dense — but their recycling generates the most concentrated lead pollution. Lead melts at just 327°C, achievable with a blowtorch — making informal backyard recycling widespread in LMICs where enforcement is weak.
• India's informal recycling paradox: India has over 350 certified formal lead recycling units. Yet approximately 90% of lead-acid battery waste ends up in the informal sector — where profits are higher due to avoided compliance costs. Burning rubber battery casings releases lead, mercury and cadmium as aerosols. This informal network is estimated to be responsible for approximately 33% of global lead poisoning burden.

• Andromeda Galaxy (Messier 31 / M31): The nearest large galaxy to the Milky Way, at approximately 2.537 million light-years (or ~778 kiloparsecs) from Earth. It is a spiral galaxy — as is the Milky Way — and is 2–2.5 times wider in diameter. Andromeda contains approximately 1 trillion stars (vs. ~250 billion in the Milky Way).
• Milky Way–Andromeda collision: The two galaxies are approaching each other at ~110 km/s. Modelling predicts a roughly 50% ("coin toss") probability of collision within the next 10 billion years. If it occurs, the merged system will likely form an elliptical galaxy (sometimes called "Milkomeda").
• Hubble Space Telescope: Launched in 1990 by NASA/ESA aboard Space Shuttle Discovery. Operates in low Earth orbit (~547 km altitude). The primary instrument for deep-space optical astronomy for three decades; has provided data on galaxy evolution, exoplanet atmospheres, and the expansion rate of the universe (Hubble Constant). Due for succession by the James Webb Space Telescope (JWST, launched December 2021) for infrared wavelengths.
• Star formation: Stars form from the gravitational collapse of dense molecular gas clouds (primarily hydrogen and helium). When a galaxy's gas supply is exhausted, disrupted, or heated, star formation ceases — the galaxy transitions from "active" (blue, star-forming) to "quiescent" (red, passive). This transition is called "galaxy quenching."
• M32 — satellite galaxy: A compact elliptical galaxy in orbit around Andromeda. Evidence now suggests M32 has recently (in cosmological terms) crashed through or interacted with Andromeda's stellar disc — disrupting the gas clouds from which stars form, creating a "dead zone" in the affected region.
• Astrophysical Journal: The flagship peer-reviewed journal of the American Astronomical Society. Findings published July 27, 2026.