April 25 in History

Lysander (; Ancient Greek: Λύσανδρος Lysandros; c. 454 BC – 395 BC) was a Spartan admiral and statesman who was one of the leading military and political figures of Sparta during the Peloponnesian War. He destroyed the Athenian fleet at the Battle of Aegospotami in 405 BC, forcing Athens to capitulate and bringing the Peloponnesian Wars to an end. He then played a key role in Sparta's domination of Greece for the next decade until his death at the Battle of Haliartus in 395 BC. Lysander's vision for Sparta differed from most Spartans; he wanted to overthrow the Athenian Empire and replace it with Spartan hegemony.

The Battle of Bagrevand was fought on 25 April 775, in the plains of Bagrevand, between the forces of the Armenian princes who had rebelled against the Abbasid Caliphate and the caliphal army. The battle resulted in a crushing Abbasid victory, with the death of the main Armenian leaders. The Mamikonian family's power in particular was almost extinguished. The battle signalled the beginning of large-scale Armenian migration into the Byzantine Empire.

Disfigurement is the state of having one's appearance deeply and persistently harmed medically, such as from a disease, birth defect, or wound. General societal attitudes towards disfigurement have varied greatly across cultures and over time, with cultures possessing strong social stigma against it often causing psychological distress to disfigured individuals. Alternatively, many societies have regarded some forms of disfigurement in a medical, scientific context where someone having ill will against the disfigured is viewed as anathema. In various religious and spiritual contexts, disfigurement has been variously described as being a punishment from the divine for sin, as being caused by supernatural forces of hate and evil against the good and just, which will be later atoned for, or as being without explanation per se with people just having to endure.

The House of York was a cadet branch of the English royal House of Plantagenet. It fought with the House of Lancaster, another cadet branch of the House of Plantagenet, for the English crown in the second half of the 15th century. The differences ultimately led to the Wars of the Roses. These wars are so named because each house had a rose in its coat of arms: York a white one and Lancaster a red one.

The Eighty Years' War or Dutch Revolt (c. 1566/1568–1648) was an armed conflict in the Habsburg Netherlands between disparate groups of rebels and the Spanish government. The causes of the war included the Reformation, centralisation, excessive taxation, and the rights and privileges of the Dutch nobility and cities. After the initial stages, Philip II of Spain, the sovereign of the Netherlands, deployed his armies and regained control over most of the rebel-held territories. However, widespread mutinies in the Spanish army caused a general uprising. Under the leadership of the exiled William the Silent, the Catholic and Protestant-dominated provinces sought to establish religious peace while jointly opposing the king's regime with the Pacification of Ghent, but the general rebellion failed to sustain itself. Despite steady military and diplomatic successes by the Governor of Spanish Netherlands and General for Spain, the Duke of Parma, the Union of Utrecht continued their resistance, proclaiming their independence through the 1581 Act of Abjuration and establishing the Calvinist-dominated Dutch Republic in 1588. In the Ten Years thereafter, the Republic (whose heartland was no longer threatened) made conquests in the north and east and received diplomatic recognition from France and England in 1596. The Dutch colonial empire emerged, which began with Dutch attacks on Portugal's overseas territories. Facing a stalemate, the two sides agreed to a Twelve Years' Truce in 1609; when it expired in 1621, fighting resumed as part of the broader Thirty Years' War. An end was reached in 1648 with the Peace of Münster when Spain retained the Southern Netherlands and recognised the Dutch Republic as an independent country.

The transition from Ming to Qing, also known as the Manchu conquest of China or Ming–Qing transition, was a decades-long period of conflict between the Qing dynasty, established by the Manchu Aisin Gioro clan in Manchuria, and the Ming dynasty in China proper and later in South China. Various other regional or temporary powers were also involved in this conflict, such as the short-lived Shun dynasty. In 1618, Nurhaci, the leader of the Aisin Gioro clan, commissioned a document titled the Seven Grievances, in which he listed complaints against the Ming before launching a rebellion. Many of the grievances concerned conflicts with the Yehe, a major Manchu clan, and the Ming's favoritism toward the Yehe at the expense of other Manchu clans. Nurhaci's demand that the Ming pay tribute to address the Seven Grievances was effectively a declaration of war, as the Ming were unwilling to pay money to a former vassal. Shortly thereafter, Nurhaci began to rebel against the Ming in Liaoning, a region in southern Manchuria. At the same time, the Ming dynasty was struggling to survive amid increasing fiscal troubles and peasant rebellions. On April 24, 1644, Beijing fell to a rebel army led by Li Zicheng, a former minor Ming official who became the leader of the peasant revolt. Li then proclaimed the Shun dynasty. At the time of the city's fall, the last Ming emperor, the Chongzhen Emperor, hanged himself on a tree in the imperial garden outside the Forbidden City. As Li Zicheng advanced toward him with his army, the general Wu Sangui, tasked by the Ming with guarding one of the gates of the Great Wall, swore allegiance to the Manchus and allowed them to enter China. Li Zicheng was defeated at the battle of Shanhai Pass by the combined forces of Wu Sangui and the Manchu prince Dorgon. On June 6, the Manchus and Wu entered the capital and proclaimed the young Shunzhi Emperor as the new Emperor of China. However, the conquest was far from complete, and it took nearly forty more years before all of China was firmly united under Qing rule. The Kangxi Emperor ascended the throne in 1661, and in 1662 his regents initiated the Great Clearance to defeat the resistance of Ming loyalists in South China. He then fought several rebellions, such as the revolt of the Three Feudatories, led by Wu Sangui, which broke out in southern China in 1673. He subsequently launched a series of campaigns that expanded his empire. In 1662, the general Koxinga expelled Dutch colonists and founded the Kingdom of Tungning in Taiwan, a Ming loyalist state, with the aim of reconquering China. However, Tungning was defeated in 1683 at the battle of Penghu by Admiral Shi Lang, who had previously served under Koxinga. The fall of the Ming dynasty resulted from a combination of factors. Kenneth Swope argues that a key factor was the deterioration of relations between the Ming royalty and the military leaders of the Ming Empire. Other factors include repeated military expeditions in the north, inflationary pressures caused by excessive spending by the imperial treasury, natural disasters, and epidemics. A peasant rebellion in Beijing in 1644 and a series of weak emperors contributed to the chaos. The Ming power survived for years in what is now southern China, though it was ultimately defeated by the Manchus.

The Battle of Almansa took place on 25 April 1707, during the War of the Spanish Succession. It was fought between an army loyal to Philip V of Spain, Bourbon claimant to the Spanish throne, and one supporting his Habsburg rival, Archduke Charles of Austria. The result was a decisive Bourbon victory that reclaimed most of eastern Spain for Philip. The Bourbon army was commanded by the Duke of Berwick, illegitimate son of James II of England, while Habsburg forces were led by Henri de Massue, Earl of Galway, an exiled French Huguenot. This makes it "probably the only battle in history in which the English forces were commanded by a Frenchman, the French by an Englishman."

A highwayman was a robber who stole from travellers. This type of thief usually travelled and robbed by horse as compared to a footpad who travelled and robbed on foot; mounted highwaymen were widely considered to be socially superior to footpads. Such criminals operated until the mid- or late 19th century. Highwaywomen, such as Katherine Ferrers, were said to also exist, often dressing as men, especially in fiction.

"La Marseillaise" is the national anthem of France. It was written in 1792 by Claude Joseph Rouget de Lisle in Strasbourg after the First French Republic declared war against Austria, and was originally titled "Chant de Guerre pour l'Armée du Rhin" ("War Song for the Army of the Rhine"). The French National Convention adopted it as the First Republic's anthem in 1795. The song acquired its nickname after being sung in Paris by Fédérés (volunteers) from Marseille marching to the capital. Its evocative melody and lyrics have led to its widespread use as a song of revolution and its incorporation into many pieces of classical and popular music. In 2013, the Italian violinist Guido Rimonda pointed out that the incipit of Giovanni Battista Viotti's "Tema e variazioni in Do maggiore" strongly resembles the anthem. This incipit was first thought to have been published before "La Marseillaise", but that appears to be a misconception, as Viotti published several variations on "La Marseillaise" in 1795 and wrote as a note "I have never composed the quartets below" (Je n'ai jamais composé les quatuors ci dessous).

The Dano-Swedish War of 1808–1809 was a war between Denmark–Norway and Sweden due to Denmark–Norway's alliance with France and Sweden's alliance with the United Kingdom during the Napoleonic Wars. Neither Sweden nor Denmark-Norway had wanted war to begin with but once pushed into it through their respective alliances, Sweden made a bid to acquire Norway by way of invasion while Denmark-Norway made ill-fated attempts to reconquer territories lost to Sweden in the 17th century. Peace was concluded on grounds of status quo ante bellum on 10 December 1809.

Admiral Sir Charles Howe Fremantle GCB (1 June 1800 – 25 May 1869) was a British Royal Navy officer. The city of Fremantle, Western Australia, is named after him.

The Thornton Affair was a battle in 1846 between the military forces of the United States and Mexico 20 miles (32 km) west upriver from Zachary Taylor's camp along the Rio Grande. The much larger Mexican force defeated the Americans in the opening of hostilities, and was the primary justification for U.S. President James K. Polk's call to Congress to declare war. It is also known as the Thornton Skirmish, Thornton's Defeat, or Rancho Carricitos.

The governor general of Canada (French: gouverneure générale du Canada) is the federal representative of the Canadian monarch, currently King Charles III. The monarch of Canada is also sovereign and head of state of 14 other Commonwealth realms and resides in the United Kingdom. The monarch, on the advice of his or her Canadian prime minister, appoints a governor general to administer the government of Canada in the monarch's name. The commission is for an indefinite period—known as serving at His Majesty's pleasure—but is usually for five years. Since 1959, it has also been traditional to alternate between francophone and anglophone officeholders. The 31st and current governor general is Louise Arbour, who was sworn in on 8 June 2026. As the sovereign's representative, the governor general carries out the day-to-day constitutional and ceremonial duties of the monarch. The constitutional duties include appointing lieutenant governors, Supreme Court justices, and senators; signing orders-in-council; summoning, proroguing, and dissolving the federal parliament; granting royal assent to bills; calling elections; and signing commissions for officers of the Canadian Armed Forces. The ceremonial duties include delivering the speech from the throne at the state opening of parliament; accepting letters of credence from incoming ambassadors; and distributing honours, decorations, and medals. Per the tenets of responsible government, the governor general acts almost always (except on the matter of honours) on the advice of the prime minister. The office began in the 17th century, when the French Crown appointed governors of the colony of Canada and, following the British conquest of the colony in 1763, the British monarch appointed governors of the Province of Quebec (later the Canadas). Consequently, the office is, along with the Crown, the oldest continuous institution in Canada. The present version of the office emerged with Canadian Confederation and the passing of the British North America Act, 1867. Although the post initially represented the government of the United Kingdom, the office was gradually Canadianized until, with the passage of the Statute of Westminster, 1931, and the establishment of a separate and uniquely Canadian monarchy, the governor general became the direct personal representative of the independently Canadian sovereign (the monarch in his Canadian council). Throughout this process of gradually increasing Canadian independence, the role of governor general took on additional responsibilities, such as acting as commander-in-chief of the Canadian militia in the monarch's stead, and, in 1927, the first official international visit by a governor general was made. In 1947, King George VI issued letters patent allowing the viceroy to exercise almost all powers on behalf of the monarch. As a matter of law, however, the governor general is not in the same constitutional position as the sovereign; the office itself does not, as such, possess any powers of the royal prerogative. Any constitutional amendment that affects the Crown, including the office of governor general, requires the unanimous consent of each provincial legislative assembly as well as the Senate and House of Commons of Canada.

The Suez Canal is an artificial sea-level waterway in Egypt, connecting the Mediterranean Sea to the Red Sea through the Isthmus of Suez and dividing Africa and Asia. The 193.3-kilometre-long (120.1-mile) canal is a key trade route between Europe and Asia.

The American Civil War was a civil war in the United States between the Union and the Confederacy, which was formed in 1861 by states that had seceded from the Union to preserve slavery in the United States. The South saw slavery as threatened because of the election of Abraham Lincoln and the growing abolitionist movement in the North. The war ended with Union victory, the dissolution of the Confederacy and the abolition of slavery, freeing four million African Americans.

The French Third Republic was the system of government adopted in France from 4 September 1870, when the Second French Empire collapsed during the Franco-Prussian War, until 10 July 1940, after the Fall of France during World War II led to the formation of the Vichy government. The French Third Republic was a parliamentary republic.

The Véry bombing was a bomb attack carried out on 25 April 1892 in Paris by the anarchist militants Théodule Meunier, Jean‑Pierre François and Fernand Bricout against the restaurant Le Véry. The three attacked the establishment in response to the arrest of Ravachol, whom the owner of the establishment, Jean‑Marie Véry, had denounced to the police and whose arrest he had enabled. For them, it was a means to target a police informer they considered a legitimate target because of his collaboration with the authorities against the anarchists. The attack pursued the series of acts committed by Ravachol and escalated the tension of the Ère des attentats (1892–1894).

The Spanish–American War (April 21 – August 13, 1898) was fought between Spain and the United States in 1898. It began with the sinking of the USS Maine in Havana Harbor in Cuba, and resulted in the U.S. acquiring sovereignty over Puerto Rico, Guam, and the Philippines, and establishing a protectorate over Cuba. It represented U.S. intervention in the Cuban War of Independence and Philippine Revolution, with the latter later leading to the Philippine–American War. The Spanish–American War brought an end to almost four centuries of Spanish presence in the Americas, Asia, and the Pacific; the United States meanwhile not only became a major world power, but also gained several island possessions spanning the globe, which provoked rancorous debate over the wisdom of expansionism. The 19th century represented a clear decline for the Spanish Empire, while the United States went from a newly founded country to a rising power. In 1895, Cuban nationalists began a revolt against Spanish rule, which was brutally suppressed by the colonial authorities. W. Joseph Campbell argues that yellow journalism in the U.S. exaggerated the atrocities in Cuba to sell more newspapers and magazines, which swayed American public opinion in support of the rebels. But historian Andrea Pitzer also points to the actual shift toward savagery of the Spanish military leadership, who adopted the brutal reconcentration policy after replacing the relatively conservative Governor-General of Cuba Arsenio Martínez Campos with the more unscrupulous and aggressive Valeriano Weyler, nicknamed "The Butcher." President Grover Cleveland resisted mounting demands for U.S. intervention, as did his successor William McKinley. Though not seeking a war, McKinley made preparations in readiness for one. In January 1898, the U.S. Navy armored cruiser USS Maine was sent to Havana to provide protection for U.S. citizens. After the Maine was sunk by a mysterious explosion in the harbor on February 15, 1898, political pressures pushed McKinley to receive congressional authority to use military force. On April 21, the U.S. began a blockade of Cuba, and soon after Spain and the U.S. declared war. The war was fought in both the Caribbean and the Pacific, where American war advocates correctly anticipated that U.S. naval power would prove decisive. On May 1, a squadron of U.S. warships destroyed the Spanish fleet at Manila Bay in the Philippines and captured the harbor. The first U.S. forces landed in Cuba on June 10 in the island's southeast, moving west and engaging in the Battles of El Caney and San Juan Hill on July 1 and then destroying the Spanish fleet and capturing Santiago de Cuba on July 17. On June 20, the island of Guam surrendered without resistance, and on July 25, U.S. troops landed on Puerto Rico, of which a blockade had begun on May 8 and where fighting continued until an armistice was signed on August 13. The war formally ended with the 1898 Treaty of Paris, signed on December 10 with terms favorable to the U.S. The treaty ceded ownership of Puerto Rico, Guam, and the Philippines to the U.S., and set Cuba up to become an independent state in 1902, although in practice it became a U.S. protectorate. The cession of the Philippines involved payment of $20 million ($770 million today) to Spain by the U.S. to cover infrastructure owned by Spain. In Spain, the defeat in the war was a profound shock to the national psyche and provoked a thorough philosophical and artistic reevaluation of Spanish society known as the Generation of '98.

World War I, or the First World War, also known as the Great War, was a global conflict between two coalitions: the Allies and the Central Powers. One of the deadliest conflicts in history, World War I resulted in an estimated 15 to 22 million deaths, including those in war crimes and genocides. The war also helped spread the Spanish flu pandemic. The conflict saw important developments in weaponry, including the first large-scale use of machine guns, artillery, aircraft, chemical weapons, and tanks.

The San Remo conference was an international meeting of the post-World War I Allied Supreme Council as an outgrowth of the Paris Peace Conference, held at Castle Devachan in Sanremo, Italy, from 19 to 26 April 1920. The San Remo Resolution passed on 25 April 1920 determined the allocation of Class "A" League of Nations mandates for the administration of three then-undefined Ottoman territories in the Middle East: "Palestine", "Syria", and "Mesopotamia". The boundaries of the three territories were "to be determined [at a later date] by the Principal Allied Powers", leaving the status of outlying areas such as Zor and Transjordan unclear. The conference was attended by the four Principal Allied Powers of World War I who were represented by the prime ministers of Britain (David Lloyd George), France (Alexandre Millerand), Italy (Francesco Nitti) and by Japan's Ambassador Keishirō Matsui.

Nazi Germany, officially the German Reich and later the Greater German Reich, was the German state between 1933 and 1945, when Adolf Hitler and the Nazi Party controlled the country, transforming it into a totalitarian dictatorship. The Third Reich, meaning "Third Realm" or "Third Empire", was the Nazi claim that Nazi Germany was the successor to the Holy Roman Empire (800–1806) and the German Empire (1871–1918); the Nazis called it the Thousand-Year Reich, but it ended just 12 years later in May 1945, when the Allies defeated Germany and entered Berlin, ending World War II in Europe. After Hitler was appointed Chancellor of Germany in 1933, the Nazi Party began to eliminate political opposition and consolidate power. A 1934 referendum confirmed Hitler as sole Führer (leader). Power was centralised in Hitler's person, and his word became the highest law. The government was not a coordinated, cooperating body, but rather a collection of factions struggling to amass power. To address the Great Depression, the Nazis used heavy military spending, extensive public works projects, including the Autobahnen (motorways), and a massive secret rearmament programme, forming the Wehrmacht (armed forces), all financed by deficit spending. The return to economic stability and end of mass unemployment boosted the regime's popularity. Hitler made increasingly aggressive territorial demands, seizing Austria in the Anschluss of 1938 and the Sudetenland region of Czechoslovakia. Germany signed a non-aggression pact with the Soviet Union and invaded Poland in 1939, launching World War II in Europe. In alliance with Fascist Italy and other Axis powers, Germany conquered most of Europe by 1940, but failed to subdue Britain. Racism, Nazi eugenics, anti-Slavism, and especially antisemitism were central ideological features of the regime. The Nazis considered Germanic peoples to be the "master race", the purest branch of the Aryan race. Jews, Slavs, Romani people, homosexuals, liberals, socialists, communists, other political opponents, Jehovah's Witnesses, Freemasons, those who refused to work and other "undesirables" were imprisoned, deported or murdered. Christian churches and citizens that opposed Hitler's rule were oppressed and opposition leaders were imprisoned. Education focused on racial biology, population policy and fitness for military service. Career and educational opportunities for women were curtailed. The Nazi Propaganda Ministry disseminated films and antisemitic canards, and organised mass rallies, fostering a pervasive cult of personality around Hitler to influence public opinion. The government controlled artistic expression, promoting specific art forms and banning or discouraging others. Genocide, mass murder and large-scale forced labour became hallmarks of the regime; the implementation of its racial policies culminated in the Holocaust. After invading the Soviet Union in 1941, Nazi Germany implemented the Generalplan Ost and Hunger Plan, as part of its war of extermination in Eastern Europe. The Soviet resurgence and entry of the United States into the war meant Germany lost the initiative in 1943, and by late 1944, had been pushed back to the 1939 border. Large-scale aerial bombing of Germany escalated, and the Axis powers were driven back in Eastern and Southern Europe. Germany was conquered by the Soviet Union from the east and the other allies from the west, and capitulated in 1945. Hitler's refusal to admit defeat led to massive destruction of German infrastructure and additional war-related deaths in the closing months of the war. The Allies subsequently initiated a policy of denazification and put many of the surviving Nazi leadership on trial for war crimes at the Nuremberg trials.

The Supreme Court of the United States (SCOTUS) is the highest court in the federal judiciary of the United States. It has ultimate appellate jurisdiction over all U.S. federal court cases, and over state court cases that turn on questions of U.S. constitutional or federal law. It also has original jurisdiction over a narrow range of cases, specifically "all Cases affecting Ambassadors, other public Ministers and Consuls, and those in which a State shall be Party". In 1803, the court asserted the power of judicial review, the ability to invalidate a statute for violating a provision of the Constitution. It is also able to strike down presidential directives for violating either the Constitution or statutory law. Under Article Three of the United States Constitution, the composition and procedures of the Supreme Court were originally established by the 1st Congress through the Judiciary Act of 1789. As currently constituted the court consists of nine justices—the chief justice of the United States and eight associate justices—who meet at the Supreme Court Building in Washington, D.C. Justices have lifetime tenure, meaning they remain on the court until they die, retire, resign, or are impeached and removed from office. When a vacancy occurs, the president, with the advice and consent of the Senate, appoints a new justice. Each justice has a single vote in deciding the cases argued before the court. When in the majority, the chief justice decides who writes the opinion of the court; otherwise, the most senior justice in the majority assigns the task. A justice may write an opinion in concurrence with the court, or they may write a dissent, and these concurrences or dissents may also be joined by other justices. On average, the Supreme Court receives about 7,000 petitions for writs of certiorari each year, but only grants about 80.

The United Negro College Fund (UNCF) is an American philanthropic organization that funds scholarships for Black students and general scholarship funds for 37 private historically black colleges and universities. UNCF was incorporated on April 25, 1944, by Frederick D. Patterson (then president of what became Tuskegee University), Mary McLeod Bethune, and others. UNCF is headquartered at 1805 7th Street, NW in Washington, D.C. In 2005, UNCF supported approximately 65,000 students at over 900 colleges and universities with approximately $113 million in grants and scholarships. About 60% of these students are the first in their families to attend college, and 62% have annual family incomes of less than $25,000. UNCF also administers over 450 named scholarships. UNCF's president and chief executive officer is Michael Lomax. Past presidents of the UNCF included William H. Gray and Vernon Jordan.

World War II, or the Second World War, was a global conflict between two coalitions: the Allies and the Axis powers. Nearly all of the world's countries participated, with many engaging in total war on an unprecedented scale. World War II was the deadliest conflict in history, causing the deaths of 60 to 75 million people, a majority of whom were civilians. Millions died as a result of massacres, starvation, disease, and genocides including the Holocaust. After the Allied victory, Germany, Austria, Japan, and Korea were occupied, and German and Japanese leaders were tried for war crimes.

Liberation Day (Italian: Festa della Liberazione [ˈfɛsta della liberatˈtsjoːne]), also known as the Anniversary of Italy's Liberation (Anniversario della liberazione d'Italia), Anniversary of the Resistance (Anniversario della Resistenza), or simply 25 April (25 aprile [ˌventiˈtʃiŋkwe aˈpriːle]) is a national holiday in Italy that commemorates the liberation of Italy from Nazi German occupation and from the collaborationist puppet state of the Italian Social Republic, during the final phase of World War II. That is distinct from Republic Day (Italy) (Festa della Repubblica), which takes place on 2 June and commemorates the 1946 Italian institutional referendum.

The United Nations Conference on International Organization (UNCIO), commonly known as the San Francisco Conference, was a convention of delegates from 50 Allied nations that took place towards the end of World War II, from 25 April to 26 June 1945 in San Francisco, California, United States. At this convention, the delegates reviewed and rewrote the Dumbarton Oaks agreements of the previous year. The convention resulted in the creation of the Charter of the United Nations, which was opened for signature on 26 June, the last day of the conference. The conference was held at various locations, primarily the War Memorial Opera House, with the Charter being signed on 26 June at the Herbst Theatre in the Veterans Building, part of the Civic Center. A square adjacent to the Civic Center, called "UN Plaza", commemorates the conference.

During World War II, the Lapland War saw fighting between Finland and Nazi Germany – effectively from September to November 1944 – in Finland's northernmost region, Lapland. Though the Finns and the Germans had been fighting together against the Soviet Union since 1941 during the Continuation War (1941–1944), peace negotiations between the Finnish government and the Allies of World War II had been conducted intermittently during 1943–1944, but no agreement had been reached. The Moscow Armistice, signed on 19 September 1944, demanded that Finland break diplomatic ties with Germany and expel or disarm any German soldiers remaining in Finland.

The Korean War was an armed conflict fought on the Korean Peninsula between North Korea and South Korea and their allies. North Korea was supported by China and the Soviet Union, while South Korea was supported by the United Nations led by the United States under the auspices of the United Nations Command (UNC).

Francis Harry Compton Crick (8 June 1916 – 28 July 2004) was an English molecular biologist, biophysicist, and neuroscientist. He, James Watson, Rosalind Franklin, and Maurice Wilkins played crucial roles in deciphering the helical structure of the DNA molecule. Crick and Watson's paper in Nature in 1953 laid the groundwork for understanding DNA structure and functions. Together with Maurice Wilkins, they were jointly awarded the 1962 Nobel Prize in Physiology or Medicine "for their discoveries concerning the molecular structure of nucleic acids and its significance for information transfer in living material". Crick was an important theoretical molecular biologist and played a crucial role in research related to revealing the helical structure of DNA. He is widely known for the use of the term "central dogma" to summarise the idea that once information is transferred from nucleic acids (DNA or RNA) to proteins, it cannot flow back to nucleic acids. In other words, the final step in the flow of information from nucleic acids to proteins is irreversible. During the remainder of his career, Crick held the post of J.W. Kieckhefer Distinguished Research Professor at the Salk Institute for Biological Studies in La Jolla, California. His later research centred on theoretical neurobiology and attempts to advance the scientific study of human consciousness. Crick remained in this post until his death in 2004; "he was editing a manuscript on his death bed, a scientist until the bitter end" according to Christof Koch.

A solar cell, also known as a photovoltaic cell, is an electronic device that converts the energy of light directly into electricity by using the photovoltaic effect. It is a type of photoelectric cell, a device whose electrical characteristics vary when it is exposed to light. Individual solar cell devices are often the electrical building blocks of photovoltaic modules, known colloquially as "solar panels". Almost all commercial PV cells consist of crystalline silicon, with a market share of 95%. Cadmium telluride thin-film solar cells account for the remainder. The common single-junction silicon solar cell can produce a maximum open-circuit voltage of approximately 0.5 to 0.6 volts.

The St. Lawrence Seaway is a system of rivers, locks, canals, and channels in Eastern Canada and the Northern United States that permits oceangoing vessels to travel from the Atlantic Ocean to the Great Lakes of North America, as far inland as Duluth, Minnesota, at the western end of Lake Superior. The seaway is named for the St. Lawrence River, which flows straight from Lake Ontario to the Atlantic Gulf of St. Lawrence. Legally, the seaway extends from Montreal, Quebec, to Lake Erie, and includes the Welland Canal. Ships from the Atlantic Ocean are able to reach ports in all five of the Great Lakes via the Great Lakes Waterway.

Robert Norton Noyce, nicknamed "the Mayor of Silicon Valley", was an American physicist and entrepreneur who co-founded Fairchild Semiconductor in 1957 and Intel Corporation in 1968. He was also credited with the realization of the first monolithic integrated circuit or microchip made with silicon, which fueled the personal computer revolution and gave Silicon Valley its name.

The Vietnam War was an armed conflict in Vietnam, Laos, and Cambodia fought between North Vietnam and South Vietnam and their allies. North Vietnam was supported by the Soviet Union and China, while South Vietnam was supported by the United States and other anti-communist nations. The conflict was the second of the Indochina wars and a proxy war of the Cold War. The Vietnam War was one of the postcolonial wars of national liberation, a theater in the Cold War, and a civil war, with civil warfare a defining feature from the outset. Direct US military involvement escalated from 1965 until US forces were withdrawn in 1973. The fighting spilled into the Laotian and Cambodian civil wars, which ended with all three countries becoming communist in 1975.

The Carnation Revolution, code-named Operation Historic Turn, also known as the 25 April, and Portuguese Revolution was a military coup in Portugal by officers that on 25 April 1974 overthrew Marcelo Caetano and the Estado Novo regime established by António de Oliveira Salazar. The coup came in the midst of the Portuguese Colonial War (1961–1974) in its overseas colonies and produced major social, economic, territorial, demographic, and political changes in Portugal and in Angola, Guinea-Bissau, Mozambique, and other former Portuguese colonies through the Ongoing Revolutionary Process. It resulted in the Portuguese transition to democracy and an end to the Portuguese Colonial War. It also had worldwide repercussions by marking the beginning of the third wave of democracy.

Dan-Air Flight 1008 was a fatal accident involving a Boeing 727-46 jet aircraft operated by Dan Air Services Limited on a chartered international passenger service from Manchester to Tenerife. The accident occurred on 25 April 1980 in a forest on Tenerife's Mount La Esperanza, when the aircraft's flight crew wrongly executed an unpublished holding pattern in an area of very high terrain; it resulted in the aircraft's destruction and the deaths of all 146 on board. Flight 1008 was Dan-Air's second major accident in ten years and the worst accident involving the deaths of fare-paying passengers in the airline's entire history, and the seventh deadliest involving a Boeing 727.

The Tsuruga Nuclear Power Plant is located in the city of Tsuruga, Fukui Prefecture, Japan. It is operated by the Japan Atomic Power Company (JAPC). The total site area is 5.12 square kilometres (1.98 sq mi) with 94% of it being green area that the company is working to preserve. The Tsuruga site is a dual site with the decommissioned prototype Fugen Nuclear Power Plant.

Israel, officially the State of Israel, is a country in the Southern Levant region of West Asia. It is bordered by Lebanon to the north, Syria to the northeast, Jordan to the east, and Egypt to the southwest. Israel's western coast lies on the Mediterranean Sea, its southern tip reaches the Red Sea, and to the east is Earth's lowest point near the Dead Sea. Jerusalem is the government seat and proclaimed capital, while Tel Aviv is Israel's largest urban area and economic centre.

The Cold War was a period of international geopolitical rivalry between the United States (US) and the Soviet Union (USSR) and their respective allies, the capitalist Western Bloc and communist Eastern Bloc. It began in the aftermath of the Second World War and ended with the dissolution of the Soviet Union in 1991. The term cold war is used because there was no direct fighting between the two superpowers, though each supported opposing sides in regional conflicts known as proxy wars. In addition to the struggle for ideological and economic influence and an arms race in both conventional and nuclear weapons, the Cold War was expressed through technological rivalries such as the Space Race, espionage, propaganda campaigns, embargoes, and sports diplomacy.

Violeta Barrios Torres de Chamorro was a Nicaraguan politician who served as the president of Nicaragua from 1990 to 1997. She was the country's first female president. Previously, she was a member of the Junta of National Reconstruction from 1979 to 1980.

The March for Women's Lives was a protest demonstration held on April 25, 2004 at the National Mall in Washington, D. C. There was approximately 1.3 million participants. The demonstration was led by seven groups; National Organization for Women, American Civil Liberties Union, Black Women’s Health Imperative, Feminist Majority, NARAL Pro Choice America, National Latina Institute for Reproductive Health, and Planned Parenthood Federation of America. The march was intended to address topics such as abortion rights, reproductive health care, women's rights, and others. Originally named the March for Freedom, the march was renamed in an effort to expand the message of "pro-choice" to include the right to have children, access to pre and post natal care, as well as sex education that were not always accessible for women of color.

The Obelisk of Axum is a 4th-century CE, 24-metre (79 ft) tall phonolite stele, weighing 160 tonnes, in the city of Axum in Ethiopia. It is ornamented with two false doors at the base and features decorations resembling windows on all sides. The obelisk ends in a semi-circular top, which used to be enclosed by metal frames.

The Amagasaki derailment occurred in Amagasaki, Hyōgo Prefecture, Japan, on 25 April 2005 at 09:19 local time, just after the local rush hour. A seven-car commuter train came off the tracks on West Japan Railway Company's Fukuchiyama Line just before Amagasaki on its way for Dōshisha-mae via the JR Tōzai Line and the Katamachi Line, and the front two cars rammed into an apartment building. The first car slid into the first-floor parking garage and as a result took days to remove, while the second slammed into the corner of the building, being crushed into an L-shape against it by the weight of the remaining cars. Of the roughly 700 passengers, 106 passengers and the driver were killed, and 562 others were injured. Most survivors and witnesses claimed that the train was travelling too fast. The incident was Japan's most deadly since the 1963 Tsurumi rail accident.

Boris Yeltsin, the first President of Russia, died of cardiac arrest on 23 April 2007, twelve days after being admitted to the Central Clinical Hospital in Moscow. Yeltsin was the first Russian head of state to be buried in a church ceremony since Emperor Alexander III, 113 years prior.

The Flint water crisis was a public health crisis from 2014 to 2019 which involved the drinking water for the city of Flint, Michigan, being contaminated with lead and possibly Legionella bacteria.

The April 2015 Nepal earthquake killed 8,962 people and injured 21,952 across the countries of Nepal, India, China and Bangladesh. It occurred at 11:56 Nepal Standard Time on Saturday 25 April 2015, with a magnitude of Mw 7.8–7.9 or Ms 8.1 and a maximum Mercalli Intensity of X (Extreme). Its epicenter was east of Gorkha District at Barpak, Gorkha, roughly 85 km (53 mi) northwest of central Kathmandu, and its hypocenter was at a depth of approximately 8.2 km (5.1 mi). It was the worst natural disaster to strike Nepal since the 1934 Nepal–India earthquake. The ground motion recorded in Kathmandu, the capital of Nepal, was of low frequency, which, along with its occurrence at an hour when many people in rural areas were working outdoors, decreased the loss of human lives.

On the evening of April 25, 2026, gunshots were fired near the main security screening area for the annual White House Correspondents' Dinner at the Washington Hilton in Washington, D.C. Shortly afterwards, President Donald Trump, First Lady Melania Trump, Vice President JD Vance, and members of Trump's Cabinet were evacuated from the event by Secret Service officials. This was the first White House Correspondents' Dinner that Trump has attended as president.