3 October 2026
A paper in Nature on 30 September 2026 tracked 9,419 meals eaten by 173 hospitalised patients undergoing blood cancer treatment.
It paired them with 1,009 stool microbiome samples.
Intake of sweets and sugars during antibiotic exposure predicted lowered alpha-diversity and greater expansion of the pathobiont Enterococcus.
Among patients with above-median sugar intake, longer antibiotic duration was linked to higher mortality risk.
In mice, sucrose with antibiotics increased Enterococcus expansion 16.3-fold on day 3 and 33.4-fold on day 6.
Meals tracked:
9,419
Patients:
173
Stool samples:
1,009
Enterococcus expansion in mice, day 6:
33.4-fold
Why it matters for exams: Links diet, antibiotics and the microbiome, a growing health-science theme.
Kerala PSCUPSC
In plain words
Enterococcus A gut bacterial genus — Here a pathobiont that expands when the microbiome is disrupted.
Dysbiosis Imbalance of gut microbes — Loss of microbial diversity.
3 October 2026
A Nature paper dated 30 September 2026 models where mangroves can establish on open coasts worldwide.
It uses 20 years of wave data from 400 coastal sites.
The model rests on the idea of windows of opportunity, periods when waves are low enough for seedlings to establish.
It predicts mangrove presence or absence with 78.2% accuracy.
Modest increases or decreases in wave forcing affect the suitability of mangrove sites, with implications for future shifts under climate change.
Sonneratia species were the most predictable by wave conditions.
Coastal sites analysed:
400
Wave data span:
20 years
Prediction accuracy:
78.2%
Why it matters for exams: Mangroves and climate change adaptation are core environment topics, especially for coastal Kerala.
Kerala PSCUPSC
In plain words
Windows of opportunity Periods of low wave energy — Spells calm enough for mangrove seedlings to take root.
3 October 2026
A Nature paper dated 30 September 2026 reports live-cell microscopy of two Asgard archaeal organisms, from the Lokiarchaea and Hodarchaea lineages, under anaerobic conditions.
The cells change shape rapidly and crawl using dynamic protrusions.
Protrusions extended at speeds of 1.5-4.8 micrometres per minute.
The movement depends on an actin-based cytoskeleton (Lokiactin), confirmed with actin inhibitors.
The authors say cellular innovations in the archaeal ancestor of eukaryotes may have helped early eukaryotic evolution.
Lineages studied:
Lokiarchaea and Hodarchaea
Protrusion speed:
1.5-4.8 micrometres per minute
Actin protein:
Lokiactin
Why it matters for exams: Asgard archaea are the closest known prokaryotic relatives of eukaryotes, a favourite evolution and biology topic.
Kerala PSCUPSC
In plain words
Asgard archaea A group of archaea — Prokaryotes considered close relatives of eukaryotes.
Cytoskeleton Internal cell scaffold — Here built on actin filaments.
Background
The African Union (AU) is a continental body made up of the member states that are the countries of the African continent. It was officially launched in July 2002 in Durban, South Africa, as successor to the Organisation of African Unity (OAU, 1963-1999). In May 1963, 32 Heads of independent African States met in Addis Ababa, Ethiopia, to sign the OAU Charter. On 9 September 1999 the OAU leaders issued the Sirte Declaration calling for an African Union. The Constitutive Act of the African Union lays out the aims of the AU, including greater unity and solidarity between African countries and defending their sovereignty, territorial integrity and independence. The AU Headquarters is in Addis Ababa, and Agenda 2063 is its blueprint for the continent's transformation.
Headquarters:
Addis Ababa, Ethiopia
Launched in:
Durban, South Africa
Predecessor:
Organisation of African Unity
Founding legal text:
Constitutive Act
Why it matters for exams: Regional bodies, their predecessors and headquarters are standard static-GK material in UPSC, SSC and Kerala PSC papers.
Kerala PSCUPSCSSC
In plain words
OAU Organisation of African Unity — Africa's first post-independence continental body, created by a Charter signed in Addis Ababa.
Agenda 2063 AU strategic framework — The AU's blueprint and master plan for inclusive and sustainable development of Africa.
Background
CERN's origins lie in the 1940s, when scientists in Europe and North America saw the need for a world-class European physics facility, to stop the brain drain to America and to unite post-war Europe. At an intergovernmental meeting of UNESCO in Paris in December 1951, the first resolution on a European Council for Nuclear Research (in French, Conseil Européen pour la Recherche Nucléaire) was adopted. Two months later an agreement was signed establishing the provisional Council, and the acronym CERN was born. The CERN Convention was agreed in June 1953 and signed by 12 States. It states that the Organization shall have no concern with work for military requirements and that its results shall be published or otherwise made generally available. CERN began in 1954, is based in Geneva, Switzerland, and its main area of research is particle physics.
Based in:
Geneva, Switzerland
Convention signed by:
12 States
Main research area:
Particle physics
Resolution adopted at:
UNESCO meeting in Paris
Why it matters for exams: CERN, the Large Hadron Collider and 'science for peace' are recurring science-and-technology questions.
Kerala PSCUPSCSSC
In plain words
CERN Conseil Européen pour la Recherche Nucléaire — The acronym comes from the French name of the provisional council set up in the early 1950s.
Brain drain Emigration of scientists — The loss of skilled scientists to another country; one reason CERN was proposed.
Background
Founded in 1930, the Bank for International Settlements (BIS) is the oldest international financial institution. It was created at the Hague Conference in the context of the Young Plan, adopted on 20 January 1930, which was meant to settle the reparation payments imposed on Germany after the First World War. A convention establishing the BIS in Switzerland was signed between Belgium, France, Germany, Italy, Japan and the United Kingdom on one side and Switzerland on the other. The BIS took over the functions of the Agent General for Reparations, and its name comes from this original role. Today it supports central banks' pursuit of monetary and financial stability through international cooperation and hosts the Basel Committee on Banking Supervision.
Seat:
Basel, Switzerland
Created at:
Hague Conference
Original task:
Handling German reparation payments
Why it matters for exams: The BIS and the Basel Committee are standard questions in banking and economy papers.
UPSCSSCBank
In plain words
Young Plan Reparations plan — The plan adopted to settle the reparation payments imposed on Germany after the First World War.
Basel Committee Basel Committee on Banking Supervision — A standard-setting committee hosted by the BIS under the Basel Process.
Background
WMO traces its roots to 1873, when the Vienna International Meteorological Congress tasked a committee with drafting rules for an international body to exchange weather information across borders. The resulting International Meteorological Organization (IMO) came into being at a congress in Rome and was a non-governmental organization. By the mid-1930s that status was seen as incompatible with the importance of meteorology, and the IMO Secretariat was moved to neutral Switzerland in 1939. The IMO became the World Meteorological Organization in March 1950, when its Convention entered into force. In 1951 WMO was designated a specialized agency of the United Nations, with a remit covering meteorology, hydrology and related geophysical sciences.
Predecessor:
International Meteorological Organization
Origin congress:
Vienna
UN status:
Specialized agency
Why it matters for exams: UN specialised agencies, their origins and mandates are a regular static-GK block in civil-service and PSC papers.
Kerala PSCUPSCSSC
In plain words
IMO International Meteorological Organization — The non-governmental forerunner of WMO, not to be confused with the International Maritime Organization.
Hydrology Study of water resources — The study, measurement and forecasting of water resources, part of WMO's mandate.
Background
The Commonwealth is a voluntary association of independent and equal countries, including both advanced economies and developing countries, and many of its members are small states. The London Declaration of 1949 marked the beginning of the modern Commonwealth, and its values are expressed in the Commonwealth Charter. Leaders agree priorities at the Commonwealth Heads of Government Meeting (CHOGM), held every two years. The Secretary-General is nominated by Commonwealth leaders and can serve a maximum of two terms of four years each. The Head of the Commonwealth is an important symbolic role with no fixed term; it is not hereditary, and future Heads will be chosen by Commonwealth leaders. The Commonwealth Secretariat and the Commonwealth Foundation are headquartered at Marlborough House on Pall Mall in London.
CHOGM frequency:
Every two years
Secretary-General term limit:
Two terms of four years each
Secretariat headquarters:
Marlborough House, London
Founding declaration of the modern Commonwealth:
London Declaration
Why it matters for exams: The Commonwealth's structure, Charter and CHOGM cycle are regular static-GK questions on international groupings.
Kerala PSCUPSCSSC
In plain words
CHOGM Commonwealth Heads of Government Meeting — The summit at which Commonwealth leaders agree priority areas of work; it meets every two years.
Commonwealth Charter Statement of values — The document that expresses the shared values and principles of Commonwealth members.
Background
The European Space Agency (ESA) was created as an intergovernmental organisation in 1975. Its purpose, under Article II of its establishing Convention, is to promote for exclusively peaceful purposes cooperation among European States in space research and technology and their space applications. ESA's headquarters are in Paris, where policies and programmes are decided. Its sites include ESTEC in Noordwijk, the Netherlands, ESOC in Darmstadt, Germany, ESRIN in Frascati near Rome, Italy, the European Astronauts Centre in Cologne, Germany, and ESAC near Madrid, Spain, plus a launch base in French Guiana. Mandatory activities are funded by member contributions calculated according to each country's gross national product, while optional programmes are chosen by each member. Under geographical return, ESA invests in each member state, through industrial contracts, an amount roughly equal to that country's contribution.
Headquarters:
Paris
Earth observation centre:
ESRIN, Frascati
Space operations centre:
ESOC, Darmstadt
Mandatory funding basis:
Gross national product
Why it matters for exams: ESA's headquarters, centres and funding model are common questions on space agencies.
Kerala PSCUPSCSSC
In plain words
Geographical return ESA industrial policy — ESA invests in each member state, through contracts, roughly what that state contributes.
Optional programmes ESA funding — Programmes each member chooses whether to join and how much to contribute.
Background
Schengen guarantees free movement to citizens of the European Union and to others legally present in the EU. The Schengen project started in 1985 on board a vessel at a point shared by Luxembourg, Germany and France, a place chosen as highly symbolic for European cooperation. The member countries cooperate closely and checks at the internal borders between them have been abolished. The area includes four non-EU countries: Iceland, Norway, Switzerland and Liechtenstein. Ireland is exceptionally allowed by the Schengen Protocol to opt out of the Schengen rules, so it continues to enforce its own visa and border policies, though it takes part in some Schengen cooperation. Schengen concerns borders and movement, and is a separate matter from the euro currency area.
Started in:
1985
Non-EU countries in the area:
Iceland, Norway, Switzerland, Liechtenstein
Opt-out under the Schengen Protocol:
Ireland
Why it matters for exams: Schengen versus the euro area is a classic European Union confusion tested in international-organisation questions.
Kerala PSCUPSCSSC
In plain words
Opt-out Exemption from EU rules — A right negotiated by a country not to take part in certain EU rules or policies.
Schengen Protocol Treaty protocol — The protocol that lets Ireland stay out of the Schengen rules.
Background
The Human Development Index (HDI) is a summary measure of average achievement in three key dimensions of human development: a long and healthy life, being knowledgeable, and having a decent standard of living. The HDI is the geometric mean of normalized indices for each of the three dimensions. The health dimension is assessed by life expectancy at birth. The education dimension is measured by mean years of schooling for adults aged 25 years and more, together with expected years of schooling for children of school-entering age. The standard of living dimension is measured by gross national income per capita; the HDI uses the logarithm of income, to reflect the diminishing importance of income with increasing gross national income. The HDI was created to emphasise that people and their capabilities, not economic growth alone, should be the ultimate criteria for assessing the development of a country. The Human Development Report Office notes that the HDI does not reflect inequalities, poverty, human security or empowerment, for which it publishes other composite indices.
Dimensions:
3
How dimensions are combined:
Geometric mean
Health indicator:
Life expectancy at birth
Income indicator:
Gross national income per capita
Why it matters for exams: That the HDI is a geometric mean, and which indicator measures each dimension, are the points most often asked about it.
Kerala PSCUPSC
In plain words
HDI Human Development Index — A summary measure of achievement in health, education and standard of living.
GNI Gross National Income — The income measure the HDI uses, taken per person and in logarithm form.
Background
The World Happiness Report is published by the University of Oxford's Wellbeing Research Centre, in partnership with Gallup, the UN Sustainable Development Solutions Network and an independent editorial board. Its global happiness ranking is based on a single question from the Gallup World Poll, derived from the Cantril Self-Anchoring Striving Scale. The report's first edition appeared in 2012. Since then it has published over 100 chapters and worked with over 150 authors from across the world, from a wide range of academic disciplines. The United Nations General Assembly, by resolution 66/281, proclaimed 20 March as the International Day of Happiness, and the report is released around that day each year. The report states that the views it expresses do not necessarily reflect those of its partners, of the University of Oxford, or of any organisation, agency or programme of the United Nations.
Publisher:
Wellbeing Research Centre, University of Oxford
Partners:
Gallup, UN Sustainable Development Solutions Network
Survey basis:
A single Gallup World Poll question from the Cantril Self-Anchoring Striving Scale
General Assembly resolution:
66/281
Why it matters for exams: Who publishes the World Happiness Report, and the scale behind its single survey question, are the details usually asked.
Kerala PSCUPSC
In plain words
SDSN Sustainable Development Solutions Network — The UN network that partners in producing the report.