The Director of the UNESCO Regional Office in Jakarta, Maki Katsuno-Hayashikawa, met the Indonesian National Commission for UNESCO at the Ministry of Culture. It was the office's first courtesy visit to the Commission, known as KNIU, since the Commission was restructured. Presidential Regulation No. 31 of 2026 placed the KNIU Secretariat under the Ministry of Culture. Minister of Culture Fadli Zon, who chairs KNIU, asked for a stronger and more structured partnership with UNESCO. UNESCO set out its work in education, sciences, culture, and communication and information. The two sides also discussed marking the 75th anniversary of UNESCO's presence in Indonesia, and exchanges with other National Commissions in Asia-Pacific.
Regulation restructuring the Commission:Presidential Regulation No. 31 of 2026Anniversary discussed:75th anniversaryUNESCO office:UNESCO Regional Office in Jakarta
Why it matters for exams: Every UNESCO member state keeps a National Commission for UNESCO, and the Jakarta office is also UNESCO's liaison to ASEAN.
UNESCOUnited Nations Educational, Scientific and Cultural Organization — The UN agency for education, the sciences, culture, and communication and information.
KNIUIndonesian National Commission for UNESCO — Indonesia's national body that links the country to UNESCO's programmes.
IceCube is a particle detector whose working material is a cubic kilometre of Antarctic ice, and it sits beside the Amundsen-Scott South Pole Station. Its in-ice part holds 5,160 digital optical modules, hung on 86 vertical strings that were frozen into boreholes between depths of 1,450 and 2,450 metres. A string carries 60 modules set 17 metres apart, and the strings follow a hexagonal grid spaced 125 metres. On the surface an array of 81 stations named IceTop, and inside the ice a closer-packed section named DeepCore, widen what the observatory can study; DeepCore pulls the neutrino energy threshold down to about 10 GeV. Neutrinos themselves are never seen. When one hits the ice it leaves charged particles behind, those particles give off Cherenkov light, and the modules time-stamp the flashes. An earlier array, AMANDA, had shown that Antarctic ice was clear enough for this. The University of Wisconsin-Madison leads the project, and the detector was finished in December 2010 at a total build cost of 279 million dollars, of which the United States National Science Foundation met about 242 million through its construction grant, partner agencies at home and abroad putting up the rest.
Optical modules in the ice:5,160Strings:86Depth of the sensors:1,450 to 2,450 metresConstruction cost:279 million dollarsLead institution:University of Wisconsin-Madison
Why it matters for exams: Neutrino detectors are a standing science question, and IceCube's South Pole site, its 86 strings and its National Science Foundation funding are the parts papers ask about.
DOMDigital optical module — The sensor unit, a ten-inch photomultiplier tube with its electronics, that records light in the ice.
DeepCoreThe denser inner subdetector of IceCube — Eight closely placed strings at the centre that let the observatory see lower-energy neutrinos.
Cherenkov lightLight from a particle moving faster than light does in that medium — The faint glow that charged particles leave in ice, which IceCube actually measures.
The Space Weather Prediction Center, part of the United States weather service, publishes a set of scales so that the public can be told plainly how bad conditions in near-Earth space are. Three kinds of disturbance are graded separately: geomagnetic storms carry the letter G, solar radiation storms the letter S, and radio blackouts the letter R. Each letter runs from level 1, described as minor, up to level 5, described as extreme, in the way hurricane and earthquake scales use numbers to carry severity. Every level is published with the effects it may bring, the physical quantity behind it and how often it tends to happen in an eleven-year solar cycle. For geomagnetic storms the physical measure is the planetary K index, and the top level corresponds to Kp 9. Solar radiation storms are graded on the flux of particles at or above 10 MeV, and radio blackouts on the brightness of the solar X-ray flare, so an X20 flare sits at the top of the R scale. At the extreme geomagnetic level whole power grids can collapse, pipeline currents reach hundreds of amps, and aurora has been seen as far south as Florida.
Event types graded:Geomagnetic storms, solar radiation storms, radio blackoutsLevels on each scale:1 (minor) to 5 (extreme)Measure behind the G scale:Planetary K index, Kp 9 at the topMeasure behind the S scale:Flux of particles at or above 10 MeV
Why it matters for exams: Space weather questions turn on what G, S and R stand for and on the planetary K index behind the geomagnetic storm scale.
The Food and Agriculture Organization runs a programme that recognises living farming systems as heritage, under the name Globally Important Agricultural Heritage Systems, shortened to GIAHS. It was launched at the World Summit on Sustainable Development, and it treats a farming system, its landscape, its agricultural biodiversity, the knowledge behind it and the culture around it as one thing to be safeguarded. The programme does not try to freeze a site in time. Its own documents argue that resilience depends on a system's ability to meet new challenges without losing its biological and cultural wealth, which is why it calls its method dynamic conservation. Proposals are invited from systems that carry agricultural and cultural heritage value and that also bear on world-wide concerns such as sustainable development and biocultural diversity, and recognition is sought at the global level with support from governments, the Organization's governing bodies and UNESCO's World Heritage Centre. Work is organised on three levels: global recognition of the idea, national mainstreaming in plans and policies, and management on the ground at each site. The case the programme makes is a plain one. Traditional farming systems still feed some two billion people, and they hold knowledge, livelihoods and culture along with the food.
Full form:Globally Important Agricultural Heritage SystemsParent agency:Food and Agriculture OrganizationLevels of work:Global, national, local or sitePeople fed by traditional systems:Some two billion
Why it matters for exams: GIAHS is the FAO's own heritage list, separate from UNESCO's, and its expansion and its parent agency are standard questions.
The Central Bank of West African States, known by its French initials BCEAO, is an international public institution with its headquarters at Dakar in Senegal. It is the single issuing institution for the West African Monetary Union, whose member States number eight: Benin, Burkina Faso, Cote d'Ivoire, Guinea-Bissau, Mali, Niger, Senegal and Togo. The bank alone may issue currency across the Union, and it is the Council of Ministers that decides when notes and coins are created, issued or cancelled. Price stability is the stated prime objective of its monetary policy. Beyond issuing money the bank centralises the Union's cash reserves, writes the rules for banks and financial institutions and supervises them; the Union's Banking Commission is chaired by the Governor of the bank, which also provides its General Secretariat. When member governments deal with the International Monetary Fund the bank acts as their financial agent, and it helps them with debt management and with drawing up a balance of payments. The CFA franc it issues is the common currency of fourteen African countries in the Franc Zone.
Headquarters:Dakar, SenegalMember States of the Union:EightPrime objective of monetary policy:Price stabilityFranc Zone countries using the CFA franc:14
Why it matters for exams: A single central bank for eight countries is a favourite comparison question, and the CFA franc and the Dakar headquarters are both asked.
NEWater is the name Singapore's national water agency gives to high-grade water reclaimed from treated used water, and it is produced in three stages. First the water passes through membranes in a step called microfiltration or ultrafiltration, which strains out particles and bacteria; a membrane bioreactor can do this job in one step and replace it. Second comes reverse osmosis: very small pores in a semi-permeable membrane let water molecules through while viruses, bacteria, heavy metals and pesticides are held back. Third the water is disinfected with ultraviolet light as a further safeguard. A study in the nineteen-seventies found reclamation technically possible but too costly, and the agency returned to it when membranes improved, commissioning a demonstration plant that made 10,000 cubic metres a day. An international panel of engineers, chemists and biomedical scientists judged the water consistently safe and within both World Health Organization and United States Environmental Protection Agency drinking water requirements, and recommended indirect potable use, meaning it is blended into raw water reservoirs. Four plants are in operation, and the biggest customers are wafer fabrication plants, which need water purer than drinking water and take it through a dedicated pipe network.
Stages of production:Microfiltration or ultrafiltration, reverse osmosis, ultraviolet disinfectionPlants in operation:4Demonstration plant output:10,000 cubic metres dailyBiggest users:Wafer fabrication plants
Why it matters for exams: Water reuse questions ask for the three stages of the NEWater process and for the agency that makes it, and the scheme is the standard example of reclaimed water policy.
Reverse osmosisForcing water through a semi-permeable membrane — The second stage of the NEWater process, which holds back salts and other contaminants.
Indirect potable useBlending reclaimed water into reservoirs before treatment — The use recommended for NEWater rather than drinking it straight from the plant.
MBRMembrane bioreactor — A single step that can take the place of the first filtration stage.
The primary frequency standard of the United States is an atomic clock of the cesium fountain type, developed in the laboratories of the National Institute of Standards and Technology at Boulder in Colorado. A standard of this rank does two jobs. It helps calibrate the international time scale, Coordinated Universal Time, and it anchors the local version of that scale, which is put together and distributed from the same Boulder laboratories. The institute's fountain group has worked through a line of machines. One called NIST-F1 held the role of primary standard for fifteen years, and a cryogenic fountain, NIST-F2, was built alongside it. Two fountains are in operation now, NIST-F3 and NIST-F4. The newest of them is an upgrade of the earlier F1 apparatus and is still being evaluated; once that is finished it will feed into the international time scale and will also be used to calibrate the absolute frequency of the optical atomic clocks of the next generation. Its accuracy is expected to approach the sixteenth decimal place in fractional frequency.
Type of clock:Cesium fountain atomic clockLaboratories:Boulder, ColoradoFountains in operation:NIST-F3 and NIST-F4International scale it calibrates:Coordinated Universal Time
Why it matters for exams: Questions on the measurement of time ask which element an atomic clock uses and which body keeps a country's frequency standard, and Coordinated Universal Time is the named scale.
Primary frequency standardA clock whose accuracy is established from first principles — It needs no comparison with another clock to be trusted, so it can calibrate others.
UTCCoordinated Universal Time — The time scale the world's clocks are set against.
The Allen Telescope Array is a radio telescope at Hat Creek in northern California, inside the Hat Creek Radio Observatory, roughly 300 miles north of San Francisco and a little north of Lassen Peak. In its present form it is made of 42 antennas, each six metres across, and the SETI Institute uses it to look for radio technosignatures while the same dishes also serve ordinary radio astronomy. The dishes do not work separately. Their signals are combined by the technique of interferometry, which lets the array make radio pictures of the sky, called imaging, or concentrate on one patch, called beamforming. This is the design its builders call a large number of small dishes: when the computers in the signal processing room put the 42 together, they give as many pixels on the sky as one dish a thousand feet across. The other strength is the feed, the part at the focus that takes in the radio waves. The original log-periodic Welch Feeds were streamlined into the present Antonio Feeds, which capture a very wide range of frequencies at once, and a new design called the Quad-Ridge Feed Horn is being worked on. The array is not the largest in the world; what sets it apart is a wide field of view and observing time dedicated to the search.
Antennas:42Diameter of each dish:6 mSite:Hat Creek Radio Observatory, northern CaliforniaTechnique:Interferometry
Why it matters for exams: The Allen Telescope Array is the named instrument in questions on the search for extraterrestrial intelligence, and interferometry is the technique asked about.
The Economic Community of West African States was set up by the Treaty of Lagos with a mandate to promote economic integration across every field of activity of its member countries. Its administrative machinery works from Abuja in Nigeria. What used to be a Secretariat was turned into a Commission, and the official who heads it is now called a President rather than an Executive Secretary. A Vice President, twelve Commissioners and an Auditor-General sit with him; the fifteen together are known as the Statutory Appointees and hold office for four years. Six more institutions stand beside the Commission: the Authority of Heads of State and Government, the Council of Ministers, the Community Parliament, the Community Court of Justice, the Specialised Technical Committees and the ECOWAS Bank for Investment and Development. Specialised agencies carry the subject work, among them the West African Health Organisation, the West African Monetary Agency, the West African Power Pool and the regional centre for renewable energy and energy efficiency. The Community also runs a macroeconomic database and surveillance system and a roadmap towards a single currency.
Founding treaty:Treaty of LagosHeadquarters:Abuja, NigeriaHead of the Commission:PresidentStatutory Appointees:15, with a four-year tenureCommunity bank:ECOWAS Bank for Investment and Development
Why it matters for exams: Regional groupings are asked by their founding treaty, their headquarters and their organs, and the Community Court of Justice is the part of ECOWAS that recurs.
The United Nations Commission on International Trade Law offers States a ready text for the hardest kind of bankruptcy, the one where a debtor's assets or creditors lie in more than one country. It is called the Model Law on Cross-Border Insolvency, and it works by making courts in different countries cooperate rather than by merging their insolvency laws into one. Differences between national procedures are left standing on purpose. The text is built around four elements: access for foreign representatives and creditors to the courts of the enacting State, recognition of qualifying foreign proceedings, the relief a court may give once it recognises them, and cooperation between courts and representatives. A recognised proceeding counts as main if the debtor's centre of main interests lay there when the case began, and as non-main if the debtor merely keeps an establishment there. Recognition of a main proceeding brings an automatic stay, while other relief is left to the court's discretion. A Guide to Enactment and Interpretation goes with the text for the governments and judges who have to apply it.
Issuing body:United Nations Commission on International Trade LawFour elements:Access, recognition, relief, cooperationTest for a main proceeding:Centre of main interestsAccompanying document:Guide to Enactment and Interpretation
Why it matters for exams: UNCITRAL and its model laws are standard polity and economy questions, and the centre of main interests test decides which proceeding is the main one.
The effect an earthquake has at the surface of the Earth is its intensity, and intensity is a separate idea from magnitude. The scale currently used in the United States for intensity is the Modified Mercalli scale, shortened to MM, and two American seismologists, Harry Wood and Frank Neumann, developed it. The scale is made up of 12 increasing levels, running from imperceptible shaking to catastrophic destruction, and they are designated by Roman numerals. A mathematical basis is not what it has; what it is instead is an arbitrary ranking based on observed effects. The lower numbers of the scale deal with the manner in which people feel the earthquake, while the higher numbers rest on observed structural damage, and that is why structural engineers usually contribute the information for the higher values. For a reader who is not a scientist the intensity at one place carries more meaning than magnitude, because it refers to the effects actually experienced there. After a widely felt earthquake the assigned intensity values are used to compile isoseismal maps showing how far each level of intensity extended, and near the epicenter the maximum observed intensity generally occurs.
Scale:Modified MercalliDeveloped by:Harry Wood and Frank NeumannLevels:12How the levels are written:Roman numeralsBuilt from:observed effects
Why it matters for exams: The difference between intensity and magnitude is a recurring geography question, and the Modified Mercalli scale with its Roman numerals is the named example.