Copper is a chemical element with symbol Cu and atomic number 29. It is a soft and ductile metal with high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pinkish-orange color. Copper is used as a conductor of heat and electricity, as a building material, as a constituent of various metal alloys, such as sterling silver used in jewelry, cupronickel used to make marine hardware and coins, constantan used in strain gauges and thermocouples for temperature measurement. Copper is one of the few metals; this led to early human use in several regions, from c. 8000 BC. Thousands of years it was the first metal to be smelted from sulfide ores, c. 5000 BC, the first metal to be cast into a shape in a mold, c. 4000 BC and the first metal to be purposefully alloyed with another metal, tin, to create bronze, c. 3500 BC. In the Roman era, copper was principally mined on Cyprus, the origin of the name of the metal, from aes сyprium corrupted to сuprum, from which the words derived and copper, first used around 1530.
The encountered compounds are copper salts, which impart blue or green colors to such minerals as azurite and turquoise, have been used and as pigments. Copper used in buildings for roofing, oxidizes to form a green verdigris. Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as bacteriostatic agents and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the respiratory enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the iron-complexed hemoglobin in fish and other vertebrates. In humans, copper is found in the liver and bone; the adult body contains between 2.1 mg of copper per kilogram of body weight. Copper and gold are in group 11 of the periodic table; the filled d-shells in these elements contribute little to interatomic interactions, which are dominated by the s-electrons through metallic bonds.
Unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are weak. This observation explains the low high ductility of single crystals of copper. At the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form, which has greater strength than monocrystalline forms; the softness of copper explains its high electrical conductivity and high thermal conductivity, second highest among pure metals at room temperature. This is because the resistivity to electron transport in metals at room temperature originates from scattering of electrons on thermal vibrations of the lattice, which are weak in a soft metal; the maximum permissible current density of copper in open air is 3.1×106 A/m2 of cross-sectional area, above which it begins to heat excessively. Copper is one of a few metallic elements with a natural color other than silver.
Pure copper acquires a reddish tarnish when exposed to air. The characteristic color of copper results from the electronic transitions between the filled 3d and half-empty 4s atomic shells – the energy difference between these shells corresponds to orange light; as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. Copper does not react with water, but it does react with atmospheric oxygen to form a layer of brown-black copper oxide which, unlike the rust that forms on iron in moist air, protects the underlying metal from further corrosion. A green layer of verdigris can be seen on old copper structures, such as the roofing of many older buildings and the Statue of Liberty. Copper tarnishes when exposed to some sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu comprising 69% of occurring copper. The other isotopes are radioactive, with the most stable being 67Cu with a half-life of 61.83 hours.
Seven metastable isotopes have been characterized. Isotopes with a mass number above 64 decay by β−, whereas those with a mass number below 64 decay by β+. 64Cu, which has a half-life of 12.7 hours, decays both ways.62Cu and 64Cu have significant applications. 62Cu is used in 62Cu-PTSM as a radioactive tracer for positron emission tomography. Copper is produced in massive stars and is present in the Earth's crust in a proportion of about 50 parts per million. In nature, copper occurs in a variety of minerals, including native copper, copper sulfides such as chalcopyrite, digenite and chalcocite, copper sulfosalts such as tetrahedite-tennantite, enargite, copper carbonates such as azurite and malachite, as copper or copper oxides such as cuprite and tenorite, respectively; the largest mass of elemental copper discovered weighed 420 tonnes and was found in 1857 on the Keweenaw Peninsula in Michigan, US. Native copper is a polycrystal
Abuja is the capital city of Nigeria located in the centre of the country within the Federal Capital Territory. It is a planned city and was built in the 1980s, replacing the country's most populous city of Lagos as the capital on 12 December 1991. Abuja's geography is defined by a 400-metre monolith left by water erosion; the Presidential Complex, National Assembly, Supreme Court and much of the city extend to the south of the rock. Zuma Rock, a 792-metre monolith, lies just north of the city on the expressway to Kaduna. At the 2006 census, the city of Abuja had a population of 776,298, making it one of the ten most populous cities in Nigeria. According to the United Nations, Abuja grew by 139.7% between 2000 and 2010, making it the fastest growing city in the world. As of 2015, the city is experiencing an annual growth of at least 35%, retaining its position as the fastest-growing city on the African continent and one of the fastest-growing in the world; as at 2016, the metropolitan area of Abuja is estimated at six million persons, placing it behind only Lagos, as the most populous metro area in Nigeria.
Major religious sites include the Nigerian National Mosque and the Nigerian National Christian Centre. The city is served by the Nnamdi Azikiwe International Airport. Abuja is known for being one of the few purpose-built capital cities in Africa, as well as being one of the wealthiest. Abuja is Nigeria's political centre, it is a key capital on the African continent due to Nigeria's geo-political influence in regional affairs. Abuja is a conference centre and hosts various meetings annually, such as the 2003 Commonwealth Heads of Government meeting and the 2014 World Economic Forum meetings. "Abuja" was in the earlier 20th century the name of the nearby town now called Suleja. The indigenous inhabitants of Abuja are the Gbagyi, with the Gbagyi language the major of the region language, others in the area being Bassa, Gade and Koro. In light of the ethnic and religious divisions of Nigeria, plans had been devised since Nigeria's independence to have its capital in a place deemed neutral to all major ethnic parties, in close proximity to all the regions of Nigeria.
The location was designated in the centre of the country in the early 1970s as it signified neutrality and national unity. Another impetus for Abuja came because of Lagos' population boom that made that city overcrowded and conditions squalid; as Lagos was undergoing rapid economic development, the Nigerian regime felt the need to expand the economy towards the inner part of the country, hence decided to move its capital to Abuja. The logic used was similar to the way Brazil planned Brasília; the decision to move to Abuja was made by General Murtala Mohammed in 1976. Construction started in the late 1970s but, due to economic and political instability, the initial stages of the city were not complete until the late 1980s; the master plan for Abuja and the Federal Capital Territory was developed by International Planning Associates, a consortium of three American firms: Planning Research Corporation. The master plan for Abuja defined the general structure and major design elements of the city that are visible in its current form.
More detailed design of the central areas of the capital its monumental core, was accomplished by Japanese architect Kenzo Tange, with his team of city planners at Kenzo Tange and Urtec company. Most countries relocated their embassies to Abuja, many maintain their former embassies as consulates in Lagos, the commercial capital of Nigeria. Abuja is the headquarters of the Economic Community of West African States and the regional headquarters of OPEC. Abuja and the FCT have experienced huge population growth. Squatter settlements and towns have spread in and outside the city limits. Tens of thousands of people have been evicted since former FCT minister Nasir Ahmad el-Rufai started a demolition campaign in 2003. Abuja under Köppen climate classification features a tropical dry climate; the FCT experiences three weather conditions annually. This includes a blistering dry season. In between the two, there is a brief interlude of harmattan occasioned by the northeast trade wind, with the main feature of dust haze and dryness.
The rainy season begins from April and ends in October, when daytime temperatures reach 28 °C to 30 °C and nighttime lows hover around 22 °C to 23 °C. In the dry season, daytime temperatures can soar as high as 40 °C and nighttime temperatures can dip to 12 °C; the chilliest nights can be followed by daytime temperatures well above 30 °C. The high altitudes and undulating terrain of the FCT act as a moderating influence on the weather of the territory; the city's inland location causes the diurnal temperature variation to be much larger than coastal cities with similar climates such as Lagos. Rainfall in the FCT reflects the territory's location on the windward side of the Jos Plateau and the zone of rising air masses with the city receiving frequent rainfall during the rainy season from April to October every year; the FCT falls within the Guinean forest-savanna mosaic zone of the West African sub-region. Patches of rain forest, occur in the Gwagwa plains in the rugged terrain to the southeastern parts of the territory, where a landscape of gullies and rough terrain is found.
These areas of the Federal Capital Territory form one of the few
Chief Obafemi Jeremiah Oyeniyi Awolowo, GCFR, was a Nigerian nationalist and statesman who played a key role in Nigeria's independence movement, the First and Second Republics and the Civil War. The son of a Yoruba farmer, he was one of the self-made men among his contemporaries in Nigeria, he was the first premier of the Western Region and federal commissioner for finance, vice chairman of the Federal Executive Council during the Civil War. He was thrice a major contender for his country's highest office. A native of Ikenne in Ogun State of south-western Nigeria, he started his career, like some of his well-known contemporaries, as a nationalist in the Nigerian Youth Movement in which he rose to become Western Provincial Secretary. Awolowo was responsible for much of the progressive social legislation that has made Nigeria a modern nation, he was the first Leader of Government Business and Minister of Local Government and Finance, first Premier of the Western Region under Nigeria's parliamentary system, from 1952 to 1959.
He was the official Leader of the Opposition in the federal parliament to the Balewa government from 1959 to 1963. In recognition of all these, Awolowo was the first individual in the modern era to be named Leader of the Yorubas. Obafemi Awolowo was born on 6 March 1909 in present-day Ogun State of Nigeria, his father was a sawyer who died when Obafemi was about ten years old. He attended various schools, including Abeokuta. Subsequently, he served as a clerk at the Wesley College Ibadan, as well as a correspondent for the Nigerian Times, it was after this that he embarked on various business ventures to help raise funds to travel to the UK for further studies. Following his education at Wesley College, Ibadan, in 1927, he enrolled at the University of London as an External Student and graduated with the degree of Bachelor of Commerce, he went to the UK in 1944 to study law at the University of London and was called to the Bar by the Honorable Society of the Inner Temple on 19 November 1946. In 1949 Awolowo founded the Nigerian Tribune, a private Nigerian newspaper, which he used to spread nationalist consciousness among Nigerians.
Awolowo was Nigeria's foremost federalist. In his Path to Nigerian Freedom – the first systematic federalist manifesto by a Nigerian politician – he advocated federalism as the only basis for equitable national integration and, as head of the Action Group, he led demands for a federal constitution, introduced in the 1954 Lyttleton Constitution, following the model proposed by the Western Region delegation led by him; as premier, he was viewed as a man of vision and a dynamic administrator. Awolowo was the country's leading social democratic politician, he supported limited central planning in government. He believed that the state should channel Nigeria's resources into education and state-led infrastructural development. Controversially, at considerable expense, he introduced free primary education for all and free health care for children in the Western Region, established the first television service in Africa in 1959, the Oduduwa Group, all of which were financed from the lucrative cocoa industry, the mainstay of the regional economy.
From the eve of independence, he led the Action Group as the Leader of the Opposition in the federal parliament, leaving Samuel Ladoke Akintola as the Western Region Premier. Disagreements between Awolowo and Akintola on how to run the Western region led the latter to an alliance with the Tafawa Balewa-led NPC federal government. A constitutional crisis led to the declaration of a state of emergency in the Western Region resulting in a widespread breakdown of law and order. Excluded from national government and his party faced an precarious position. Akintola's followers, angered at their exclusion from power, formed the Nigerian National Democratic Party under Akintola's leadership. Having suspended the elected Western Regional Assembly, the federal government reconstituted the body after manoeuvres that brought Akintola's NNDP into power without an election. Shortly afterwards Awolowo and several disciples were arrested, charged and jailed for conspiring with the Ghanaian authorities under Kwame Nkrumah to overthrow the federal government.
In 1992, the Obafemi Awolowo Foundation was founded as an independent, non-profit, non-partisan organisation committed to furthering the symbiotic interaction of public policy and relevant scholarship with a view to promoting the overall development of the Nigerian nation. The Foundation was launched by the President of Nigeria at that time, General Ibrahim Babangida, at the Liberty Stadium, Ibadan. However, his most important bequests are his exemplary integrity, his welfarism, his contributions to hastening the process of decolonisation and his consistent and reasoned advocacy of federalism-based on ethno-linguistic self-determination and uniting politically strong states-as the best basis for Nigerian unity. Awolowo died peacefully at his Ikenne home, the Efunyela Hall, on 9 May 1987, at the age of 78 and was laid to rest in Ikenne, amid tributes across political and ethno-religious divides. Path to Nigerian Freedom Awo – Autobiography of Chief Obafemi Awolowo My Early Life Thoughts on the Nigerian Constitution The People’s Republic The Strategy & Tactics of the People's Republic of Nigeria The Problems of Africa – The Need for Ideological Appraisa
Zuma Rock is a large monolith, an igneous intrusion composed of gabbro and granodiorite, located in Niger State, Nigeria. It rises spectacularly west of Nigeria's capital Abuja, along the main road from Abuja to Kaduna off Madala, is sometimes referred to as the "Gateway to Abuja from Suleja". Zuma Rock rises 725 metres above its surroundings. Zuma is depicted on the 100 naira note, it was used for a defensive retreat by the Gbagyi people against invading neighbouring tribes during intertribal warring. World 66 Abuja.net
The Fula people or Fulani or Fulɓe, numbering between 38 and 40 million people in total, are one of the largest ethnic groups in the Sahel and West Africa dispersed across the region. Inhabiting many countries, they live in West Africa and northern parts of Central Africa but in, South Sudan and regions near the Red Sea coast. A significant proportion of the Fula – a third, or an estimated 12 to 13 million – are pastoralists, making them the ethnic group with the largest nomadic pastoral community in the world; the majority of the Fula ethnic group consisted of semi-sedentary people as well as sedentary settled farmers, artisans and nobility. As an ethnic group, they are bound together by their history and their culture. More than 90% of the Fula are Muslims; the Fulas are leaders in many West African countries. These include the president of Muhammadu Buhari, they are leaders in International Institutions such as the Deputy Secretary-General of the United Nations, Amina J. Mohammed. There are many names used in other languages to refer to the Fulɓe.
Fulani in English is borrowed from the Hausa term. Fula, from Manding languages, is used in English, sometimes spelled Fulah or Fullah. Fula and Fulani are used in English, including within Africa; the French borrowed the Wolof term Pël, variously spelled: Peul and Peuhl. More the Fulfulde / Pulaar term Fulɓe, a plural noun has been Anglicised as Fulbe, gaining popularity in use. In Portuguese, the terms Fula or Futafula are used; the terms Fallata Fallatah or Fellata are of Kanuri origins, are the ethnonyms by which Fulani people are identified by in parts of Chad and in Sudan. The Fula people are distributed, across the Sahel from the Atlantic coast to the Red Sea in West Africa; the countries where they are present include Mauritania, Senegal, the Gambia, Nigeria, Sierra Leone, Burkina Faso, Guinea Bissau, Ivory Coast, Chad, South Sudan the Central African Republic, as far east as the Red Sea in Sudan and Egypt. With the exception of Guinea, where the Fula make up the largest ethnic group, Mali, Burkina Faso and Niger, Fulas are either a significant or a minority ethnic group in nearly all other countries they live in.
Alongside, many speak other languages of the countries they inhabit, making many Fulani bilingual or trilingual in nature. Such languages include French, Bambara and Arabic. Major concentrations of Fulani people exist in the Fouta Djallon highlands of central Guinea and south into the northernmost reaches of Sierra Leone; this is the area known as the Fombina meaning "The South" in Adamawa Fulfulde, because it represented the most southern and eastern reaches of Fulɓe hegemonic dominance in West Africa. In this area, Fulfulde is the local lingua franca, language of cross cultural communication. Further east of this area, Fulani communities become predominantly nomadic, exist at less organized social systems; these are the areas of the Chari-Baguirmi Region and its river systems, in Chad and the Central African Republic, the Ouaddaï highlands of Eastern Chad, the areas around Kordofan and the Blue Nile, Kassala regions of Sudan, as well as the Red Sea coastal city of Port Sudan. The Fulani on their way to or back from the pilgrimage to Mecca, Saudi Arabia, settled in many parts of eastern Sudan, today representing a distinct community of over 2 million people referred to as the Fellata.
While their early settlements in West Africa were in the vicinity of the tri-border point of present-day Mali and Mauritania, they are now, after centuries of gradual migrations and conquests, spread throughout a wide band of West and Central Africa. The Fulani People occupy a vast geographical expanse located in a longitudinal East-West band south of the Sahara, just north of the coastal rain forest and swamps. There are an estimated 20-25 million Fulani people. There are three different types of Fulani based on settlement patterns, viz: the Nomadic/Pastoral or Mbororo, The Semi-Nomadic and the Settled or "Town Fulani"; the pastoral Fulani move around with their cattle throughout the year. They do not stay around, for long stretches; the semi-nomadic Fulani can either be Fulɓe families who happen to settle down temporarily at particular times of the year, or Fulɓe families who do not "browse" around past their immediate surroundings, though they possess livestock, they do not wander away from a fixed or settled homestead not too far away, they are "In-betweeners".
Settled Fulani live in villages and cities permanently and have given u
A currency, in the most specific sense is money in any form when in use or circulation as a medium of exchange circulating banknotes and coins. A more general definition is that a currency is a system of money in common use for people in a nation. Under this definition, US dollars, pounds sterling, Australian dollars, European euros, Russian rubles and Indian Rupees are examples of currency; these various currencies are recognized as stores of value and are traded between nations in foreign exchange markets, which determine the relative values of the different currencies. Currencies in this sense are defined by governments, each type has limited boundaries of acceptance. Other definitions of the term "currency" are discussed in their respective synonymous articles banknote and money; the latter definition, pertaining to the currency systems of nations, is the topic of this article. Currencies can be classified into two monetary systems: fiat money and commodity money, depending on what guarantees the currency's value.
Some currencies are legal tender in certain political jurisdictions. Others are traded for their economic value. Digital currency has arisen with the popularity of the Internet. Money was a form of receipt, representing grain stored in temple granaries in Sumer in ancient Mesopotamia and in Ancient Egypt. In this first stage of currency, metals were used as symbols to represent value stored in the form of commodities; this formed the basis of trade in the Fertile Crescent for over 1500 years. However, the collapse of the Near Eastern trading system pointed to a flaw: in an era where there was no place, safe to store value, the value of a circulating medium could only be as sound as the forces that defended that store. A trade could only reach as far as the credibility of that military. By the late Bronze Age, however, a series of treaties had established safe passage for merchants around the Eastern Mediterranean, spreading from Minoan Crete and Mycenae in the northwest to Elam and Bahrain in the southeast.
It is not known what was used as a currency for these exchanges, but it is thought that ox-hide shaped ingots of copper, produced in Cyprus, may have functioned as a currency. It is thought that the increase in piracy and raiding associated with the Bronze Age collapse produced by the Peoples of the Sea, brought the trading system of oxhide ingots to an end, it was only the recovery of Phoenician trade in the 10th and 9th centuries BC that led to a return to prosperity, the appearance of real coinage first in Anatolia with Croesus of Lydia and subsequently with the Greeks and Persians. In Africa, many forms of value store have been used, including beads, ivory, various forms of weapons, the manilla currency, ochre and other earth oxides; the manilla rings of West Africa were one of the currencies used from the 15th century onwards to sell slaves. African currency is still notable for its variety, in many places, various forms of barter still apply; these factors led to the metal itself being the store of value: first silver both silver and gold, at one point bronze.
Now we have other non-precious metals as coins. Metals were mined and stamped into coins; this was to assure the individual accepting the coin that he was getting a certain known weight of precious metal. Coins could be counterfeited, but the existence of standard coins created a new unit of account, which helped lead to banking. Archimedes' principle provided the next link: coins could now be tested for their fine weight of metal, thus the value of a coin could be determined if it had been shaved, debased or otherwise tampered with. Most major economies using coinage had several tiers of coins of different values, made of copper and gold. Gold coins were the most valuable and were used for large purchases, payment of the military and backing of state activities. Units of account were defined as the value of a particular type of gold coin. Silver coins were used for midsized transactions, sometimes defined a unit of account, while coins of copper or silver, or some mixture of them, might be used for everyday transactions.
This system had been used in ancient India since the time of the Mahajanapadas. The exact ratios between the values of the three metals varied between different eras and places. However, the rarity of gold made it more valuable than silver, silver was worth more than copper. In premodern China, the need for credit and for a medium of exchange, less physically cumbersome than large numbers of copper coins led to the introduction of paper money, i.e. banknotes. Their introduction was a gradual process which lasted from the late Tang dynasty into the Song dynasty, it began as a means for merchants to exchange heavy coinage for receipts of deposit issued as promissory notes by wholesalers' shops. These notes were valid for temporary use in a small regional territory. In the 10th century, the Song dynasty government began to circulate these notes amongst the traders in its monopolized salt industry; the Song government granted several shops the right to issue banknotes, in the early 12th century the government took over these shops to produce state-issued currency.
Yet the banknotes issued w
Legal tender is a medium of payment recognized by a legal system to be valid for meeting a financial obligation. Paper currency and coins are common forms of legal tender in many countries. Legal tender is variously defined in different jurisdictions. Formally, it is anything. Thus, personal cheques, credit cards, similar non-cash methods of payment are not legal tender; the law does not relieve the debt obligation. Coins and banknotes are defined as legal tender; some jurisdictions may restrict payment made other than by legal tender. For example, such a law might outlaw the use of foreign coins and bank notes or require a license to perform financial transactions in a foreign currency. Designation of a particular form of money as legal tender means "that the designated money is valid payment for all debts unless there is a specific agreement to the contrary". In some jurisdictions legal tender can be refused as payment if no debt exists prior to the time of payment. For example, vending machines and transport staff do not have to accept the largest denomination of banknote.
Shopkeepers may reject large banknotes: this is covered by the legal concept known as invitation to treat. The right, in many jurisdictions, of a trader to refuse to do business with any person, means a purchaser may not insist on making a purchase and so declaring a legal tender in law, as anything other than an offered payment for debts incurred would not be effective. Under U. S. federal law, cash in U. S. dollars is a legal offer of payment for antecedent debts when tendered to a creditor. By contrast, federal statutes do not require that someone, not a pre-existing creditor must accept currency or coins as payment for goods or services. Private businesses may formulate their own policies on whether to accept cash unless state law requires otherwise; the term "legal tender" is from French tendre, meaning to offer. The Latin root is tendere, the sense of tender as an offer is related to the etymology of the English word "extend". Demonetization is the act of stripping a currency unit of its status as legal tender.
It occurs whenever there is a change of national currency: The current form or forms of money is pulled from circulation and retired to be replaced with new notes or coins. Sometimes, a country replaces the old currency with new currency; the opposite of demonetization is remonetization, in which a form of payment is restored as legal tender. Coins and banknotes may cease to be legal tender if new notes of the same currency replace them or if a new currency is introduced replacing the former one. Examples of this are: The United Kingdom, adopting decimal currency in place of pounds and pence in 1971, Banknotes remained unchanged. In 1968 and 1969 decimal coins which had precise equivalent values in the old currency were introduced, while decimal coins with no precise equivalent were introduced on 15 February 1971; the smallest and largest non-decimal circulating coins, the half penny and half crown, were withdrawn in 1969, the other non-decimal coins with no precise equivalent in the new currency were withdrawn in 1971.
Non-decimal coins with precise decimal equivalents remained legal tender either until the coins no longer circulated, or the equivalent decimal coins were reduced in size in the early 1990s. The 6d coin was permitted to remain in large circulation throughout the United Kingdom due to the London Underground committee's large investment in coin-operated ticketing machines that used it. Old coins returned to the Royal Mint through the UK banking system will be redeemed by exchanging them for legal tender currency with no time limits; the successor states of the Soviet Union replacing the Soviet ruble in the 1990s. Currencies used in the Eurozone before being replaced by the euro are not legal tender, but all banknotes are redeemable for euros for a minimum of 10 years. India demonetised its 500 and 1000 rupee notes on 8 November 2016; this action affected 86 percent of all cash in circulation. The demonetisation action was intended to curb black money, the hoarding of unaccounted cash, sponsorship of terrorism, but led to long queues from bank runs, leaving more than 30 people dead.
The old notes are now being replaced by new 2000 rupee notes. The Philippines has ceased 2 peso and 50 centavo coins of Flora and Fauna Series in 2000, due to overminting of the coins of BSP Series that has not included the 2 peso and 50 centavo coins of that series. Individual coins or banknotes can be demonetised and cease to be legal tender, but the Bank of England does redeem all Bank of England banknotes by exchanging them for legal tender currency at its counters in London regardless of how old they are. Banknotes issued by retail banks in the UK are not legal tender, but one of the criteria for legal protection under the Forgery and Counterfeiting Act is that banknotes must be payable on demand, therefore withdrawn notes remain a liability of the issuing bank without any time limits. In the case of the euro, coins an