On May 25, 1521, the Holy Roman Emperor Charles V issued the Edict of Worms, the formal decree closing the great imperial assembly known as the Diet of Worms by declaring the rebel monk Martin Luther a heretic and an outlaw. Just over three years earlier Luther had nailed his Ninety-five Theses to a Wittenberg church door, protesting the sale of indulgences and other practices of the Catholic Church and igniting the Protestant Reformation. Summoned to Worms to answer for his writings, Luther had famously refused to recant before the emperor, the assembled princes and the papal envoys, declaring that his conscience was captive to the Word of God. The edict that followed was severe: Luther was banned from the empire, his works were ordered burned, his followers branded heretics, and it became a punishable crime to give him food or shelter. In practice the decree was unenforceable. Luther was already being secretly protected by his prince, Frederick the Wise, who spirited him away to Wartburg Castle, where he translated the New Testament into vigorous German prose. The Reformation roared on, splitting Western Christendom and reshaping European religion, politics and culture for centuries. The Edict of Worms is remembered as a futile attempt to bottle a revolution that had already escaped the bottle.

On May 25, 1660, Charles II of England stepped ashore at Dover, ending more than a decade of exile and beginning the period in English history known as the Restoration. His father, Charles I, had been executed in 1649 at the end of a civil war that left England a republic under the firm grip of Oliver Cromwell. With Cromwell's death and his son Richard's failure to hold power, the army and Parliament invited the exiled prince back to take the throne. He landed at Dover to be greeted by huge crowds, the mayor and a Bible, and rode toward London amid scenes of national rejoicing — bonfires, ringing bells and a sense of relief that the unhappy republican experiment was over. Charles entered the capital on May 29, his thirtieth birthday, and his restoration was complete. The Restoration brought back not just the monarchy but the Church of England, the House of Lords and a freer culture after the Puritan austerity of the Commonwealth; theaters reopened, and Restoration drama with its sparkling wit was born. The reign was eventful — plague, the Great Fire of London, war with the Dutch, scientific revolution and political turbulence — and Charles, known as the Merry Monarch, presided over it with a mixture of cynicism and charm. The day he stepped ashore at Dover marked a major turning point in English history.

On May 25, 1787, after eleven days of waiting for enough delegates to arrive, the Constitutional Convention formally opened in the Pennsylvania State House in Philadelphia — the same brick building, today known as Independence Hall, where the Declaration of Independence had been signed eleven years before. Fifty-five delegates from twelve states (Rhode Island declined to send any) eventually attended. Their stated task was to revise the existing Articles of Confederation, the weak framework under which the new United States had been governing itself unsuccessfully since the Revolution. They quickly decided instead to draft something entirely new. By unanimous vote, the delegates chose George Washington — the most revered American of his age — to preside, lending the gathering enormous credibility. Behind closed doors and sworn to secrecy, they argued through a long Philadelphia summer about how a republic should be structured, balancing power among large states and small, between slave-holding and free, between executive, legislature and courts, between the federal whole and its constituent states. Out of those debates emerged the Constitution of the United States, signed on September 17, 1787, ratified the following year, and still in force today. The Convention's opening on this day set in motion one of the most consequential meetings in the history of the modern world.

On May 25, 1810, in the city of Buenos Aires, a week of public assemblies and political pressure — Argentine history's "May Week" — culminated in the deposing of the Spanish viceroy Baltasar Hidalgo de Cisneros and the establishment of the Primera Junta, the first national government of what would become Argentina. The May Revolution, as the events are known, exploited the chaos in Spain itself, where Napoleon's armies had toppled the Bourbon king and left the colonies' ties to the mother country in doubt. Patriot leaders in the Río de la Plata seized the moment, replacing royal authority with a junta of locally chosen leaders who claimed to be governing in the king's name but who in practice were stepping out on their own. The revolution did not immediately declare independence — that came formally in 1816 — but it set in motion the long war that ended three centuries of Spanish rule in the southern cone of South America and helped trigger independence movements across Spanish America. Within a generation, the entire mainland empire of Spain in the New World had broken apart into new republics. May 25 is celebrated as a national day in Argentina, the founding moment of the country's political life.

On May 25, 1895, at London's Old Bailey court, the Irish playwright Oscar Wilde — the dazzling wit who had been the most fashionable man of letters in England — was convicted of "gross indecency with other male persons" and sentenced to two years of hard labor. He had been at the very height of his powers, with The Importance of Being Earnest playing to acclaim in the West End, when he made the disastrous decision to sue the Marquess of Queensberry for libel over a card calling him a sodomite. The libel case collapsed and turned the tables on Wilde, leading to his own arrest under the Labouchere Amendment of 1885, which criminalized male homosexual acts in Britain. After one hung jury he was retried and convicted. The sentence was brutal: hard labor in Pentonville and then Reading Gaol broke his health and ruined him financially. From his cell he wrote the long confessional letter that would be published as De Profundis, and after his release, exiled in France, he produced the haunting Ballad of Reading Gaol before his death in poverty in Paris in 1900. His conviction became one of the most famous miscarriages of justice in literary history and a touchstone in the long struggle for the decriminalization of homosexuality, which Britain would not finally achieve until 1967.

On May 25, 1925, a grand jury in the small Tennessee town of Dayton indicted John T. Scopes, a young high-school science teacher, for violating the state's newly passed Butler Act, which prohibited the teaching of "any theory that denies the story of the Divine Creation of man as taught in the Bible" — that is, the theory of evolution by natural selection. The indictment had been engineered. Town boosters and the American Civil Liberties Union, looking for a test case to challenge the Butler Act, had persuaded Scopes to admit he had used a state-approved textbook that taught evolution. Out of that small-town scheme came the most famous trial of its decade. The case in July 1925 pitted the silver-tongued populist William Jennings Bryan, three-time Democratic presidential nominee, who joined the prosecution to defend biblical literalism, against the great Chicago defense lawyer Clarence Darrow, who fought for Scopes and for science. Broadcast on the new medium of radio, the trial was a spectacle dubbed the "Monkey Trial," culminating in Darrow's devastating cross-examination of Bryan on the witness stand. Scopes was convicted and fined $100 (a verdict later overturned on a technicality), but the trial fixed America's long, unresolved cultural argument over science, religion, education and free inquiry.

On May 25, 1935, at the Big Ten Conference track-and-field championships in Ann Arbor, Michigan, a 21-year-old African American sophomore from Ohio State named Jesse Owens delivered what is widely regarded as the greatest single afternoon any athlete has ever had. In the span of about 45 minutes Owens tied or broke four world records. He started by tying the world record in the 100-yard dash. Then, despite a sore back that had nearly kept him out of the meet entirely, he leapt into the long-jump pit and on his only attempt set a record of more than 26 feet (about 8 meters) that would stand for a quarter-century. He won the 220-yard dash, breaking the world mark, and then the 220-yard low hurdles, breaking another. Four world records in less than an hour — a feat ESPN and many other authorities have called the greatest single moment in sport. The astonishing Ann Arbor afternoon was prologue to even greater fame. Fourteen months later, Owens went to the Berlin Olympics and won four gold medals under the eyes of Adolf Hitler, his triumph an enduring rebuke to Nazi racial ideology. Honored too late by his own segregated country, Jesse Owens remains a towering figure in the history of American sport and civil rights.

On May 25, 1955, the British climbers Joe Brown and George Band stood within a few feet of the summit of Mount Kangchenjunga, the world's third-highest mountain at 8,586 meters (28,169 feet) — and, by deliberate choice, went no farther. Their expedition, led by Charles Evans, had reached the peak that straddles the border of Nepal and India on the spine of the eastern Himalayas. Before setting out, the team had promised the chogyal, or king, of Sikkim that the mountain's sacred summit, revered by Sikkimese as the home of mountain gods, would never be trodden by human feet. Brown and Band kept that promise: they stopped a few feet short of the absolute top, and every subsequent successful expedition has by tradition done the same. (Two of their teammates repeated the feat the following day.) The climb was a major mountaineering achievement of the post-war years, completing the British "high-altitude trinity" begun with Everest in 1953, and it set a model of cultural respect that is still cited as a rare example of mountaineering accommodating the beliefs of the people for whom the mountain is sacred. Kangchenjunga remains one of the most difficult and revered peaks in the Himalayas, and the first ascent stands as both a feat of climbing and a quiet act of humility on the roof of the world.

On May 25, 1977, a film called simply Star Wars opened on a modest 32 American screens, written and directed by a young filmmaker named George Lucas. Studio executives had been nervous; Lucas himself was so resigned to failure that he skipped the premiere week for a holiday in Hawaii. Within days the country was lining up around the block. By summer's end Star Wars had become a national phenomenon, by year's end a global one, and ultimately one of the most lucrative and influential films ever made. Set "a long time ago in a galaxy far, far away," it married mythic storytelling with dazzling new special effects, a stirring John Williams score and an unforgettable cast of characters — Luke Skywalker, Princess Leia, Han Solo, Darth Vader, the droids — to create a fresh kind of cinematic experience. The film changed Hollywood permanently: it ushered in the era of the summer blockbuster, demonstrated the staggering commercial potential of merchandising and sequels, and pushed visual-effects technology forward by giant strides through Lucas's company Industrial Light & Magic. Beyond cinema it became one of the great shared mythologies of modern popular culture, generating a franchise of films, television, books, games and toys that has flourished across half a century. Later retitled Star Wars: Episode IV – A New Hope, the original retains the simple, exhilarating power of its first release on this day.

On May 25, 2012, the SpaceX Dragon capsule was carefully grappled by the Canadian robotic arm of the International Space Station and berthed to the orbiting laboratory — the first time in history a privately built and operated spacecraft had reached the station. The achievement marked the formal arrival of the commercial spaceflight era. SpaceX, the company founded a decade earlier by Elon Musk to drive down the cost of access to space, had launched the unmanned Dragon atop one of its own Falcon 9 rockets three days earlier, on a NASA contract to ferry cargo to the ISS. After tense rendezvous maneuvers, Dragon held station, was captured by astronaut Don Pettit at the arm's controls, and was berthed at the station's Harmony module. It carried about a half-ton of supplies and returned a similar load to Earth — the first vehicle since the retirement of the Space Shuttle to bring cargo back from the ISS. The flight demonstrated that NASA's policy of contracting routine space operations out to private industry could actually work, paving the way for regular SpaceX cargo missions and, eventually, for Crew Dragon to carry astronauts to and from the station. The berthing on this day was a turning point in spaceflight: the moment when low-Earth orbit began to be opened up to private enterprise.

On the evening of May 25, 2020, in Minneapolis, Minnesota, a 46-year-old Black man named George Floyd died after a white police officer, Derek Chauvin, knelt on his neck for more than nine minutes during an arrest over a suspected counterfeit $20 bill, while Floyd repeatedly told the officers he could not breathe. The whole encounter was filmed on the phone of a teenage bystander, Darnella Frazier, and within hours the video had spread around the world. Floyd's death — coming during the disorienting first months of the Covid-19 pandemic and following other recent killings of Black Americans — set off the largest wave of protests in modern United States history, with marches in hundreds of American cities and in dozens of countries across the globe. Demonstrators, mostly peaceful and remarkably diverse, demanded accountability and broader change in how the country polices Black communities, with the slogan "Black Lives Matter" entering everyday speech. Chauvin was tried, convicted of murder in 2021, and sentenced to long prison terms in both state and federal court; three other officers present were also convicted. Floyd's killing became a defining moment in twenty-first-century American civil-rights history, prompting policing reforms in many jurisdictions and a long, contested national reckoning that continues to unfold.

Ralph Waldo Emerson, born in Boston, Massachusetts, was perhaps the most influential American man of letters of the nineteenth century — an essayist, lecturer and poet whose ideas helped shape what it meant to think and speak as an American. Trained as a Unitarian minister, Emerson left the pulpit after a personal crisis and reinvented himself as a public philosopher, traveling on the lyceum circuit to deliver lectures that he polished into the essays for which he is famous. From his book Nature (1836), with its mystical vision of the divine immanent in the natural world, through addresses such as "The American Scholar" — which Oliver Wendell Holmes called America's intellectual declaration of independence — to essays like "Self-Reliance," "Compensation" and "The Over-Soul," Emerson preached individual conscience, original thought, intuition over inherited dogma, and a confident embrace of life in the New World. He gathered a remarkable circle around him in Concord, Massachusetts, including Henry David Thoreau, Margaret Fuller and Nathaniel Hawthorne, the heart of the Transcendentalist movement. His thought influenced Walt Whitman and generations of American writers, religious thinkers and reformers, including the abolitionists and the New Thought tradition. Emerson's style — aphoristic, paradoxical, often electrifyingly quotable — remains startling on the page nearly two centuries later. He died in 1882 in Concord.

Bill "Bojangles" Robinson, born in Richmond, Virginia, was the most celebrated African American tap dancer of his era and a pioneer who broke through racial barriers in American entertainment. Orphaned as a small child and raised by his grandmother, he started dancing on the street for coins at five and was working as a child performer by his teens. He developed a clean, precise, upright style that emphasized clarity of taps over showy upper-body movement and became famous on the vaudeville circuit for his signature "stair dance," in which he tapped up and down a flight of steps. By the 1920s he was the highest-paid Black entertainer in the United States, and in the 1930s he crossed over to Hollywood, appearing in films alongside Shirley Temple in a long-running partnership that, however limited by the racial conventions of its day, made him a household name. He was famously generous, giving away staggering sums to charity. Beyond his dancing, Robinson held novelty world records — most charmingly the 75-yard backward dash (8.2 seconds) — and he is credited with introducing the word "copacetic," meaning "all is well," into wider American English. He died in 1949; his funeral procession through Harlem drew enormous crowds. Robinson is remembered as a foundational figure of American dance and a key Black star in an age when such stars were rare.

Igor Sikorsky, born in Kyiv (then in the Russian Empire), was one of the great aviation pioneers of the twentieth century, the engineer who designed the world's first successful multi-engine airplanes and, decades later, the first practical helicopter. As a young man in pre-revolutionary Russia he produced the four-engine Russky Vityaz and Ilya Muromets, far ahead of their time, demonstrating that big, multi-engine, multi-passenger aircraft were viable. Fleeing the Russian Revolution and the Bolshevik regime, he eventually settled in the United States in 1919 and founded what would become Sikorsky Aircraft. Through the 1920s and 1930s his company built large flying boats — the famed S-42 and S-44 Clippers that pioneered transoceanic Pan American passenger service — and in 1939 Sikorsky returned to his earliest dream, the helicopter. His experimental VS-300, whose first successful free flight took place on May 24, 1940 — the day before his birthday and the hero of this site's May 24 page — proved that a single main rotor with a tail rotor for stability could deliver controlled vertical flight, the configuration nearly every helicopter uses to this day. From that breakthrough came the first mass-produced helicopter and the entire global rotorcraft industry. Sikorsky died in 1972, but his name still appears on aircraft that lift the wounded from battlefields, rescue people from the sea, and reach places no airplane can. He is one of the rare engineers to give birth to two distinct kinds of flight.

Robert Ludlum, born in New York City, was one of the most popular American novelists of the late twentieth century, a writer of fast-paced international thrillers whose books sold by the hundreds of millions and whose creation Jason Bourne would, decades later, anchor a Hollywood franchise. After a career as a Broadway actor and theatrical producer, Ludlum came late to novel-writing, publishing his first thriller, The Scarlatti Inheritance, in 1971. From then until his death he produced a stream of bestsellers in a distinctive register — bewildered ordinary protagonists swept into vast shadowy conspiracies involving intelligence agencies, ancient cabals and rogue Cold War actors — with breathless action, exotic locales and shocking revelations on almost every page. His most famous creation was Jason Bourne, the amnesiac assassin trying to recover his identity, introduced in The Bourne Identity (1980) and continued in The Bourne Supremacy and The Bourne Ultimatum; a long-running and hugely successful series of films starring Matt Damon, beginning in 2002 after Ludlum's death, would make Bourne a global pop-culture figure all over again. Ludlum's other best-known works include The Holcroft Covenant, The Rhinemann Exchange and The Chancellor Manuscript. He died in 2001, but the franchise built on his name, including posthumous novels by other writers, continues to thrive.

Sir Ian McKellen, born in Burnley, Lancashire, is one of the most distinguished British actors of his generation, a Shakespearean of immense range whose late-career embrace of fantasy cinema also made him one of the most beloved figures in twenty-first-century popular film. Trained at Cambridge and on the regional repertory stage, McKellen rose through the 1960s and 1970s to become a leading actor with both the Royal Shakespeare Company and the National Theatre, acclaimed for searing performances as Richard III, Macbeth, Iago and Coriolanus and for a famously intimate solo Macbeth opposite Judi Dench. He won the Olivier Award again and again. In 1988 he came out publicly as gay during a campaign against an anti-gay British law, becoming a leading advocate for LGBTQ rights, work for which he was knighted. Then, when many of his peers were winding down, McKellen embarked on a remarkable second career as a fantasy-film icon, playing the wizard Gandalf in Peter Jackson's Lord of the Rings and Hobbit trilogies — for which he received an Oscar nomination — and the mutant Magneto in the X-Men films. With his warm gravitas, his magnificent voice and a mischievous twinkle, McKellen has become a treasured public figure as well as a great actor, equally at home in Stratford and on the Mountain Caradhras.

Frank Oz — born Richard Frank Oznowicz in Hereford, England, to Dutch-Polish puppeteer parents and raised in California — is the legendary puppeteer, voice actor and filmmaker who gave life to some of the most beloved characters in modern entertainment. As a teenager he met Jim Henson, and from the late 1960s onward Oz became Henson's closest creative collaborator on the Muppets, performing and voicing a roster of unforgettable characters: Miss Piggy and Fozzie Bear on The Muppet Show; Cookie Monster, Bert and Grover on Sesame Street; and, most reverently of all, the diminutive Jedi master Yoda in five Star Wars films, beginning with The Empire Strikes Back in 1980. His ability to imbue felt and foam with distinct personalities, by turns hilarious, tender and wise, was extraordinary. From the 1980s onward Oz also built a major second career as a film director, behind the camera on a string of well-loved movies including Little Shop of Horrors, Dirty Rotten Scoundrels, What About Bob?, In & Out and Bowfinger. Recipient of multiple Daytime Emmys for his Muppet performances and a Lifetime Achievement Award from Sesame Workshop, Frank Oz is treasured as a quietly genius collaborator whose work has delighted children and adults across generations.

Klaus Meine, born in Hannover, West Germany, is the lead singer of Scorpions, one of the most internationally successful rock bands ever to come out of Germany, and the voice — and chief lyricist — behind some of the most familiar arena-rock anthems of the 1980s and 1990s. Joining Scorpions in 1969, Meine has been the band's constant frontman for more than half a century, his clean, expressive tenor making him an unusual rarity among hard-rock singers in an era of more rasping voices. The band's breakthrough came in the early 1980s with hits such as "Rock You Like a Hurricane" and the ballad "Still Loving You," followed by power ballads like "Wind of Change," written by Meine in the dying days of the Cold War and released in 1990, just as the Berlin Wall fell and Eastern Europe transformed. With its whistled opening and lyrics about Moscow nights, the song became one of the great unofficial anthems of the end of the Cold War, selling many millions of copies. Meine and Scorpions have continued to record and tour internationally for decades since, beloved in Europe, Russia and Asia. A devoted environmentalist and quietly dignified figure offstage, Klaus Meine has given a half-century of rock its most distinctive German voice.

Mike Myers, born in the Toronto suburb of Scarborough, Ontario, is one of the most commercially successful comic film stars of his generation, a versatile writer-performer whose characters have populated some of the biggest comedy franchises of the past three decades. He cut his teeth in the famed Second City improv theaters of Toronto and Chicago before joining Saturday Night Live in 1989, where over the next several years he created a gallery of indelible characters — most enduringly Wayne Campbell, the lovable basement metalhead of the "Wayne's World" sketches, which Myers spun off into a 1992 film hit. From there he created Austin Powers, the swinging-1960s British secret agent thawed out into the present, whose three blockbuster films in the late 1990s and 2000s made "groovy, baby" a global catchphrase and let Myers play multiple characters from Powers himself to Dr. Evil and Fat Bastard. He also voiced the ogre Shrek in the wildly successful animated franchise, four films of which became one of DreamWorks Animation's defining series. With his lightning-quick character work and unabashed love of silly, sharply written comedy, Mike Myers helped shape what mainstream American film comedy sounded like at the turn of the twenty-first century.

Octavia Spencer, born in Montgomery, Alabama, is one of the most acclaimed American actresses of her generation, an Oscar-winning performer whose grounded warmth and sly wit have made her a beloved presence in dramas, comedies and prestige films alike. She began her screen career in small roles in the 1990s while working as a casting assistant. The breakthrough came in 2011 with The Help, in which she played the maid Minny Jackson in the Jim Crow South — a performance that won her the Academy Award for Best Supporting Actress. She made history by becoming the first Black actress nominated for Oscars in three different films (The Help, Hidden Figures and The Shape of Water), and the first Black actress nominated in two consecutive years. In Hidden Figures she played the NASA mathematician Dorothy Vaughan, helping bring a long-overlooked history of Black women in American science to wide audiences. She has since taken on producing roles, championed films and television led by women and people of color, and become one of Hollywood's most respected veterans, equally at home in independent dramas, big studio films and warm comedies, admired both for her craft and for her grace.

Karan Johar, born in Mumbai to the film producer Yash Johar, is one of the most recognizable and powerful figures in contemporary Hindi cinema, a director, producer and television personality whose name has been synonymous for a quarter-century with the glossy, big-budget Bollywood family drama. After helping out on his father's productions and acting briefly on screen, he made his directorial debut at just 26 with Kuch Kuch Hota Hai (1998), a romantic blockbuster that lit up Indian cinemas and became an international phenomenon, especially among the South Asian diaspora. He followed with Kabhi Khushi Kabhie Gham (2001), Kabhi Alvida Naa Kehna (2006), My Name Is Khan (2010) and other widely loved films, refining a style of lavishly designed, emotionally heightened, multi-generational dramas built around big stars and unforgettable songs. As head of his father's company Dharma Productions, he has also produced dozens of films by other directors and helped launch a generation of younger Indian stars. He hosts the popular celebrity chat show Koffee with Karan and is a leading public voice in Hindi cinema. Polarizing as he is influential, Karan Johar remains, more than anyone of his generation, the impresario of mainstream Bollywood storytelling.

Cillian Murphy, born in Cork, Ireland, is one of the most distinctive Irish actors of his generation, a performer of pale, almost unsettling intensity whose meticulous craft has carried him from independent Irish films to the top of Hollywood. Trained on the Dublin stage and considered for a time a possible rock musician before he committed to acting, Murphy first drew international attention as the cyclist hero of Danny Boyle's 28 Days Later in 2002 and reached a new audience the next year as a haunted Irish freedom fighter in Ken Loach's The Wind That Shakes the Barley, which won the Palme d'Or at Cannes. A long collaboration with the director Christopher Nolan gave him roles in The Dark Knight trilogy as the villain Scarecrow and in Inception. The character that made him a global household name, however, was Tommy Shelby, the cool, ruthless head of a Birmingham crime family in the lavish BBC series Peaky Blinders, which ran from 2013 to 2022 and became a cult worldwide hit. In 2023 came the role of his career: J. Robert Oppenheimer in Nolan's film Oppenheimer, a performance of immense quiet intensity that won him the Academy Award for Best Actor — the first Irishman to receive that honor.

Karthi, born Karthik Sivakumar in Madras (now Chennai), Tamil Nadu, is one of the most popular Tamil-language film actors of his generation, the younger son of the veteran Tamil star Sivakumar and the brother of fellow leading man Suriya. Trained as a mechanical engineer with a master's degree from Binghamton University in New York, Karthi spent his early career behind the camera as an assistant director, including on his brother's film Aayutha Ezhuthu (2004), before stepping in front of it. His debut as a leading man, Paruthiveeran (2007) — a stark, intensely felt rural drama in which he played a brutal village rough — startled critics and audiences alike and won him the Filmfare Award for Best Actor in Tamil. He has since built a versatile career across action films (Kaithi, Khaidi), socially conscious dramas (Madras), thrillers (Paiyaa), comedies (Saguni) and big historical epics, most notably Mani Ratnam's lavish two-part adaptation of the Tamil classic Ponniyin Selvan (2022-2023). Off-screen he is known for social-welfare work, particularly with farmers. A pleasing trivia coincidence: Karthi was born on May 25, 1977 — the very day George Lucas's Star Wars opened in American cinemas on the other side of the world. He is one of the leading stars of contemporary South Indian film.

Pedro Calderon de la Barca, who died in Madrid on May 25, 1681, was the towering Spanish playwright of the seventeenth century, the successor to Lope de Vega as the greatest dramatist of the Spanish Golden Age and the author of one of world theater's undisputed masterpieces, La vida es sueno — Life Is a Dream. Born in Madrid in 1600 and educated by the Jesuits and at the universities of Alcala and Salamanca, Calderon entered the household of a Castilian nobleman and began writing plays for the court of King Philip IV in the early 1620s. He produced more than two hundred works — full-length comedias, religious autos sacramentales for the festival of Corpus Christi, court plays and musical zarzuelas — and was rewarded with a knighthood in the Order of Santiago. Life Is a Dream, a philosophical drama set in Poland that grapples with free will, fate, illusion and the nature of reality, is considered one of the supreme works of European theater. After serving in the wars of his time, Calderon took priestly orders in 1651 and became chaplain to King Philip and the official dramatist of the city of Madrid, continuing to write into old age. His carefully constructed, intellectually dense plays — with their preoccupation with honor, the vanity of human existence, and the search for truth amid appearances — represent the apex of Spain's great age of theater.

Gustav Holst, who died in London on May 25, 1934, was the English composer best known for one of the most popular orchestral works of the twentieth century — The Planets, a seven-movement suite portraying the astrological character of each planet known in his day. Born to a musical family of partly Swedish descent, Holst trained at the Royal College of Music and spent much of his life as a devoted music teacher, most famously at St. Paul's Girls' School in Hammersmith, where the resident orchestra would première much of his work. The Planets, composed between 1914 and 1916 against the backdrop of the First World War, was an instant and enduring success, its grand "Mars, the Bringer of War" pounding into popular consciousness alongside the haunting "Venus, the Bringer of Peace," the noble grand-hymn melody of "Jupiter, the Bringer of Jollity," and the eerie wordless women's chorus of "Neptune, the Mystic." The Planets' influence on film music, especially the score of John Williams, is incalculable. Holst wrote a great deal of other distinguished music — operas, choral works such as The Hymn of Jesus, the elegant orchestral St. Paul's Suite and English-folk-song-rooted band music — and was a close friend and trusted collaborator of Ralph Vaughan Williams. The Planets remains his calling card, but the breadth of his output marks him as one of the central English composers of his age.

Robert Capa, who died at Thai Binh in northern Vietnam on May 25, 1954, was one of the most celebrated war photographers of the twentieth century, a Hungarian-born photojournalist whose unflinching images of conflict helped define what the camera could do and helped invent the modern profession of the war correspondent. Born Endre Friedmann in Budapest and forced into exile from Hungary as a young leftist, he reinvented himself in Paris in the 1930s as "Robert Capa," an invented persona of an American photographer that helped him sell his work. The disguise dissolved as he established himself in his own right with searing dispatches from the Spanish Civil War, including the controversial but iconic Falling Soldier of 1936. He photographed the Second World War for Life magazine and went in with the first wave of U.S. troops on Omaha Beach on D-Day, June 6, 1944, producing the few surviving frames that defined the visual memory of that day. After the war he co-founded Magnum Photos with Henri Cartier-Bresson and others, the great cooperative photographers' agency. Carrying on into the next war he documented the First Indochina War for Life and was killed when he stepped on a landmine in a paddy field at age 40. His credo, often quoted, was that if your pictures are not good enough, you are not close enough — a discipline he paid for with his life.

Alberto Korda, the Cuban photographer who died in Paris on May 25, 2001, was the man behind one of the most famous and most reproduced photographs ever taken — the heroic portrait of the Argentine revolutionary Ernesto "Che" Guevara, beret-clad and gazing into the distance, that became a global emblem of rebellion. Born in Havana as Alberto Diaz Gutierrez and trained in fashion and commercial photography, Korda became Fidel Castro's personal photographer after the 1959 Cuban Revolution, documenting the new regime's leaders at home and on visits abroad. On March 5, 1960, at a funeral for the victims of the explosion of the freighter La Coubre in Havana harbor, he caught Che, then 31, in a momentary expression of grief and resolve. He titled the picture Guerrillero Heroico, "Heroic Guerrilla." It went unpublished for years before being passed by Korda to an Italian publisher after Che's death in 1967; from there it spread to posters, T-shirts, murals and tattoos around the world, becoming inseparable from the global iconography of the political 1960s. Korda never collected royalties — he believed Cuban revolutionary work should not be sold — though he later objected to its use to sell commercial products. Beyond Che he produced a substantial body of photojournalism, fashion and underwater work that has been celebrated in major retrospectives since his death.

Wojciech Jaruzelski, who died in Warsaw on May 25, 2014, was the dark-glasses-clad Communist Polish general and politician who imposed martial law on his country in 1981 to crush the independent Solidarity trade union, and who later, as the Cold War unwound, presided over Poland's peaceful transition to democracy. Born to a Polish noble family deported to the Soviet Union during the Second World War, he rose through the Polish army to become its top general and then, in 1981, the head of state and party leader during a period of accelerating crisis. On December 13 of that year, citing the threat of Soviet invasion if Solidarity continued to expand, Jaruzelski declared martial law, jailing thousands of activists including the future Nobel laureate Lech Walesa, and snuffing out the burgeoning trade-union movement at terrible human cost. He long argued that he had chosen the lesser evil to prevent a Soviet intervention that would have been even worse, a claim historians still debate. By 1989, with the Soviet empire crumbling, Jaruzelski negotiated the Round Table Agreement with Solidarity, opening the way to free elections that swept his side from power. He served briefly as Poland's first president before stepping aside in 1990. He spent his last decades defending his record against criminal charges and historical judgment, a deeply controversial figure to the end.

May 25 is Africa Day, the continent's annual celebration of unity, liberation and shared aspiration, observed across Africa and in the African diaspora around the world. The date commemorates a single, founding moment: on May 25, 1963, leaders of 32 newly independent African states met in Addis Ababa, Ethiopia, hosted by Emperor Haile Selassie, and signed the charter establishing the Organisation of African Unity (OAU). Coming at the high tide of African decolonization, the OAU was meant to coordinate the continent's political and diplomatic life, to support the liberation of those African territories still under colonial or white-minority rule, and to defend the sovereignty of the new states. Over four decades the organization helped accelerate decolonization and apartheid's end, while struggling with its own limits and the principle of non-interference. In 2002 it was succeeded by the African Union, a more integrated body with broader ambitions including political and economic union, peace and security, and human rights. Africa Day was retained as the AU's flagship observance, marked across the continent with cultural festivals, official ceremonies and reflection on Africa's common journey. For nations born of long struggles for independence, and for a diaspora carried by history far from home, May 25 remains a day to celebrate African identity, achievements and continuing aspirations.

May 25 is Towel Day, an affectionate worldwide tribute to the British comic writer Douglas Adams in which fans of his work make a point of carrying a towel wherever they go that day. The custom was inspired by Adams's beloved comic science-fiction novel The Hitchhiker's Guide to the Galaxy, in which the narrator solemnly explains that a towel is the most massively useful thing an interstellar hitchhiker can have — useful for warmth on cold moons, as a sail on a mini raft, as a weapon in hand-to-hand combat, and, above all, for the deep psychological reassurance it provides to anyone with the wit to carry one. Douglas Adams died unexpectedly of a heart attack in May 2001, at just 49, robbing the world of one of its most original comic voices. Two weeks later, on May 25, 2001, grieving fans on the internet organized the first Towel Day in his memory, and the observance has spread ever since to gatherings, conventions and quiet acts of remembrance in dozens of countries. Towel Day is in equal measure a goofy in-joke and a serious thank-you to a writer whose hilarious, melancholy and humane vision of the universe shaped how a generation thinks about life, the universe, and everything. The answer, as every fan knows, is 42.