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WonderHistory

Bayard Rustin ran the day-to-day planning of the 1963 March on Washington, where Martin Luther King Jr. gave his 'I Have a Dream' speech. He led a team of 200 activists and organisers and arranged the buses, trains, marshals and sound. As a gay Black man in an openly homophobic era, he was repeatedly kept out of public view.

The veteran labour leader A. Philip Randolph brought Rustin in to organise the march in 1962. Roy Wilkins of the NAACP, wary of Rustin's past, would not let him take public credit, so Randolph became director and Rustin his deputy. Weeks before the march, Senator Strom Thurmond called Rustin a 'Communist, draft-dodger, and homosexual' and had the file on his 1953 arrest in Pasadena entered into the Congressional Record. That arrest had already forced Rustin out of the Fellowship of Reconciliation, the pacifist group he worked for. In 1947 he had organised the Journey of Reconciliation, the first Freedom Ride against segregation on interstate buses. In the 1980s, with his partner Walter Naegle, he spoke out for gay rights. He died in 1987; in 2013 Barack Obama awarded him the Presidential Medal of Freedom posthumously.

Bayard Rustin / March on Washington for Jobs and FreedomRead card

WonderScience

A Venus flytrap counts: it snaps shut only when the tiny trigger hairs inside its trap are touched twice within about 20 seconds. The trap closes in about a tenth of a second, and digestion starts only after further touches show that live prey is struggling inside.

The plant is native only to the coastal wetlands of North and South Carolina, where the soil is poor in nutrients, so insects and spiders supply the nitrogen it lacks. Each touch of a trigger hair fires an electrical signal similar to a nerve impulse. In 2016 Rainer Hedrich's team at the University of Würzburg in Germany showed how the counting works: two signals close the trap, and further signals switch on the genes for digestive enzymes, so the more the prey struggles, the more enzymes the plant makes. The rule stops the plant wasting energy on raindrops or windblown debris. Digestion takes about ten days, after which the trap reopens. Charles Darwin studied the flytrap closely for his 1875 book Insectivorous Plants and called it one of the most wonderful plants in the world.

Ikigai DailyRead card

StillnessMind

Learning a skill can make you more aware of what is going wrong before you know how to put it right. That can be a frustrating stretch: you can see what you want to do, but cannot quite do it yet.

Trainers describe this stretch with a model called the four stages of competence: unconscious incompetence (not knowing what you don't know), conscious incompetence (seeing the gap), conscious competence (doing it right, but only with effort) and unconscious competence (doing it without thinking). The frustrating stage on this card is the second. Noel Burch used the model at Gordon Training International in the 1970s; it is often wrongly credited to the psychologist Abraham Maslow.

Original reflectionRead card

WonderHealth

In 1858, Florence Nightingale published a circular mortality diagram from the Crimean War. Blue areas showed deaths from preventable disease, red from wounds and black from other causes. The blue overwhelmed the red: far more British soldiers were dying from disease than from battle wounds.

The diagram covered April 1854 to March 1856 month by month, and it showed deaths from disease falling sharply once sanitary conditions improved. Nightingale had led the nurses at the British army's hospital in Scutari, housed in the Selimiye Barracks in today's Üsküdar, Istanbul. She used this kind of chart, now often called a polar area or “rose” diagram, to make a point that plain tables could not: disease, not the enemy, was killing most of the soldiers. After the war she campaigned to reform army medicine and hygiene, and in 1858 she became the first female member of the Statistical Society of London, now the Royal Statistical Society.

Florence Nightingale, Crimean War mortality statistics, 1858Read card

DriveTechnology

Kerb cuts, the small ramps where a pavement meets the road, were won by disabled campaigners for wheelchair users. They now help anyone pushing a pram, pulling a suitcase or wheeling a trolley.

Kalamazoo, Michigan, installed some of the first kerb cuts in the 1940s, in a pilot scheme proposed by the lawyer and war veteran Jack H. Fischer to help disabled veterans get to work. In the 1970s the Center for Independent Living in Berkeley, California, a group run by disabled people and co-founded by Ed Roberts, pushed for cuts along Telegraph and Shattuck Avenues, creating one of the first continuous step-free routes through an American city. The Americans with Disabilities Act of 1990 later made kerb ramps a legal requirement on new and altered streets across the United States. In 2017 the policy advocate Angela Glover Blackwell named the wider pattern the 'curb-cut effect': a change made for one group often ends up helping almost everyone.

Smithsonian / Stanford Social Innovation ReviewRead card

WonderOcean

The barreleye Macropinna microstoma has tubular eyes beneath a transparent, fluid-filled shield, and can rotate them from looking upward to looking forward.

The barreleye lives about 600 to 800 metres down in the northern Pacific and grows to around 15 centimetres. It was described in 1939, but for decades it was known only from specimens hauled up in nets, which destroyed the soft shield, and its eyes were thought to be fixed, pointing straight up. Bruce Robison and Kim Reisenbichler of the Monterey Bay Aquarium Research Institute filmed living barreleyes off California with a remotely operated submersible and, in a 2008 paper, showed the green eyes turning inside the intact dome. The two dark spots above the mouth that look like eyes are in fact its organs of smell. Robison has suggested that the fish may steal food from siphonophores, stinging relatives of jellyfish, with the shield protecting its eyes.

BarreleyeRead card

WonderHistory

On 2 March 1955, fifteen-year-old Claudette Colvin refused to give up her bus seat for a white passenger in Montgomery, Alabama. Police removed and arrested her. Nine months before Rosa Parks's protest, Colvin had already challenged the same system of racial segregation.

Montgomery's civil rights leaders decided not to build a public campaign around Colvin. She was a teenager, she became pregnant later that year while unmarried, and she has said that her dark skin also counted against her; leaders feared the white press would use her story against the cause, and months later they rallied behind Rosa Parks. Colvin's stand still mattered: in 1956 she was one of four plaintiffs in Browder v. Gayle, the federal case that ended segregation on Montgomery's buses. She moved to New York, worked for 35 years as a nurse's aide in a Manhattan nursing home and retired in 2004. Her juvenile record was expunged in 2021, and she died in January 2026, aged 86.

Historical account — U.S. National Park Service; Claudette Colvin interview (2020)Read card

WonderScience

The Mariana Trench in the western Pacific is so deep that Mount Everest could fit inside it with more than two kilometres of water above its peak.

The trench's deepest point, the Challenger Deep, lies about 10,935 metres below the surface, according to measurements made during dives between 2019 and 2021. Everest stands 8,849 metres high, so its summit would still be around 2,000 metres under water. The trench forms where the Pacific plate slides beneath the smaller Mariana plate. The first people to reach the bottom were Jacques Piccard and Don Walsh, in the deep-diving vessel Trieste in 1960; the film director James Cameron made a solo dive in 2012, and the explorer Victor Vescovo has dived there several times since 2019. The water pressure at the bottom is more than a thousand times that at sea level.

Ikigai DailyRead card

WonderTechnology

In 1941 the Swiss engineer George de Mestral came home from a walk in the Alps curious about the burrs stuck to his dog. Under a microscope he saw tiny hooks catching in loops of fur, and he spent the next decade turning that idea into Velcro.

The burrs came from burdock, a common wayside plant whose seed heads are covered in tiny hooks that cling to passing animals. De Mestral worked for years with weavers in Lyon to copy the hooks and loops in fabric; nylon, sewn under infrared light, finally worked. He patented the system in the 1950s and named it Velcro, from the French velours (velvet) and crochet (hook). Textile experts at first laughed at it, and it only took off after NASA used it to hold objects in place in weightlessness on the Apollo missions. It is often cited as an early example of biomimicry, the practice of copying designs found in nature.

Invention historyRead card

WonderLanguage

Rongorongo is a script of glyphs carved into wood on Rapa Nui (Easter Island). More than twenty inscribed objects survive, but no proposed decipherment has won scholarly acceptance, and the texts remain unread.

The glyphs show human, animal, plant and geometric shapes. They are written in reverse boustrophedon: the reader follows one line from left to right, then turns the tablet upside down to read the next. Outsiders first reported the tablets in 1864, soon after Peruvian slave raids and a smallpox epidemic had killed much of the island's population, apparently including those who could read them. No bilingual text has been found to serve as a key. The surviving pieces are kept in museums and collections off the island, from the Santiago Staff in Chile's capital to tablets in Rome and Washington, and claims of a solution have so far failed to convince specialists.

RongorongoRead card

WonderScience

Wangari Maathai, a Kenyan biologist, founded the Green Belt Movement in 1977, training rural women to plant trees to stop soil erosion, protect water sources and provide firewood. When the movement opposed grabs of public forests and parks, the government had her arrested several times, and police once beat her unconscious.

Maathai earned a doctorate in veterinary anatomy in 1971, the first woman in East Africa to do so. In 1989 she campaigned against a 60-storey tower, with a large statue of President Daniel arap Moi, planned for Nairobi's Uhuru Park. Members of parliament ridiculed her and the government forced her out of her office, but foreign investors pulled out in January 1990 and the project collapsed. In March 1992, during a hunger strike in the park for the release of political prisoners, police knocked her unconscious and she was taken to hospital. By 2004, when she became the first African woman to win the Nobel Peace Prize, the Green Belt Movement had planted more than 30 million trees. She died in 2011.

The Nobel Prize official archivesRead card

WonderTechnology

On 22 May 1973 Robert Metcalfe, a researcher at Xerox's research centre in Palo Alto, California (Xerox PARC), wrote a memo describing a way to link the lab's computers by cable. With David Boggs he turned it into Ethernet, which first ran that November; most wired networks still use it.

Metcalfe named it after the ‘luminiferous aether’, the invisible medium that 19th-century physicists wrongly believed carried light; the cable would be a shared medium for data. The idea grew from ALOHAnet, a radio network at the University of Hawaii in which computers shared one channel and, if two messages collided, each sender waited a random moment and tried again. Ethernet added a rule to listen before sending. The first Ethernet, working on 11 November 1973, linked Xerox Alto computers at about 3 million bits a second; today's versions reach hundreds of billions. In 1979 Metcalfe founded the company 3Com. In 1980 Xerox, Intel and Digital Equipment published Ethernet as an open standard that any manufacturer could use, and in 1983 the engineering body IEEE adopted it as an official standard. Metcalfe received the Turing Award, computing's highest honour, in 2023.

Xerox PARC, 1973Read card

StillnessMind

Sometimes your hand is already on its way to the phone before you've decided anything. There was no buzz and no message you were waiting for. Next time, pause before you pick it up and notice what you wanted to check.

Habit researchers say this happens when an action has been repeated often enough in the same situation: the setting itself, such as an idle moment, a queue or a pause in work, starts the movement before any conscious decision. In a 2002 diary study, the psychologist Wendy Wood and colleagues found that about 43 per cent of people's daily actions were repeated almost every day in the same setting, often while they were thinking about something else.

Original reflectionRead card

WonderHistory

When Rosa Parks refused to give up her bus seat in Montgomery, Alabama, in 1955, she had spent twelve years in the NAACP, America's leading civil-rights group. She had investigated racial violence, worked on voter registration and attended a desegregation workshop. Her refusal came from an experienced organiser who knew the risks.

Parks joined the Montgomery branch of the NAACP in December 1943 and became its secretary. In 1944 she investigated the case of Recy Taylor, a Black woman assaulted by a group of white men, and she later advised the branch's Youth Council. In the summer of 1955 she attended a workshop on desegregation at Highlander Folk School in Tennessee, a training centre for activists. Her arrest that December helped start the 381-day Montgomery Bus Boycott, which ended after the Supreme Court's Browder v. Gayle ruling against bus segregation. She lost her department-store job, moved to Detroit in 1957 and worked for Congressman John Conyers from 1965 to 1988. In 2005 she became the first woman to lie in honour in the U.S. Capitol.

Rosa Parks Papers, Library of CongressRead card

WonderScience

Octopus suckers can taste by touch. Special receptors in them detect chemicals on a surface, so an arm can tell food from rock the moment it makes contact, much as a tongue senses taste and touch at once.

In 2020 a team led by Nicholas Bellono at Harvard identified the molecules behind this “taste by touch”. They found a family of receptors that exists only in cephalopods, the group that includes octopuses, squid and cuttlefish. Called chemotactile receptors, they respond to chemicals on contact, especially substances that do not dissolve easily in water. Such chemicals stay on surfaces instead of drifting away, so they would be hard to smell from a distance. Some cells in each sucker specialise in touch and others in taste, and much of the information is handled in the arm's own nerve cord rather than the brain. In 2025 the same group reported that the receptors also pick up molecules made by bacteria living on surfaces. Signals from the microbes on prey and on eggs helped guide an octopus's hunting and the care of its eggs.

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WonderScience

Every year the Arctic tern flies from its Arctic breeding grounds to the edge of Antarctica and back, following summer across the planet on a round trip that can exceed 70,000 kilometres.

Arctic terns nest around the Arctic during the northern summer, then fly south to spend the southern summer near the Antarctic pack ice. Living through two summers a year, they see more daylight than any other animal. Small light-sensitive tags called geolocators, which work out a bird's position from the times of sunrise and sunset, showed in 2010 that terns from Greenland and Iceland averaged about 70,900 kilometres a year. A tern tagged on the Farne Islands off north-east England flew about 96,000 kilometres in ten months, because the birds take winding routes that follow winds and food. Many live 15 to 30 years, and over a lifetime a tern may fly some 2.4 million kilometres, more than three return trips to the Moon.

National Geographic SocietyRead card

WonderArchitecture

Shibam, a walled town in Yemen, is packed with about 500 mud-brick tower houses, some eleven storeys and over 30 metres tall. Built mostly in the 16th century, it is one of the oldest examples of a city planned to grow upwards.

People have lived at Shibam, in the long desert valley of Wadi Hadramawt, for about 1,700 years. A great flood in 1532–33 destroyed much of the earlier town, which was rebuilt on a rocky rise above the valley floor. Enclosed by a single defensive wall, it had little room to spread, so houses went up instead, with one or two rooms on each floor. Thick walls of sun-dried mud brick keep interiors cool in the desert heat, but they need constant upkeep: floods from a tropical storm in 2008 brought down several buildings. Shibam is often called the Manhattan of the Desert, and UNESCO listed it as a World Heritage Site in 1982.

Old Walled City of ShibamRead card

DriveTechnology

The standard shipping container lets goods travel from ship to train to lorry without being unpacked. Put to work at scale by Malcolm McLean in 1956, it made world trade far cheaper.

Before containers, cargo was loaded piece by piece: sacks, crates and barrels carried aboard by teams of dockworkers, while ships often waited in port for days. Malcolm McLean, an American trucking businessman, had a converted tanker, the Ideal X, carry 58 containers from Newark to Houston in April 1956. He estimated that loading loose cargo cost $5.86 a ton, against about 16 cents a ton by container. In the late 1960s international standards fixed the box sizes and the corner fittings that lock boxes to cranes, trucks and each other, so any port could handle any container. Ports needed far fewer dockworkers, and many cities built new container terminals away from their old harbours.

Smithsonian / National Inventors Hall of FameRead card

WonderHistory

On 29 August 1867, Karl Heinrich Ulrichs stood before about 500 German jurists in Munich and called for the laws against sex between men to be abolished. His motion had been kept off the agenda; he spoke anyway and was shouted down. Since 1864 he had published pamphlets arguing that such love is inborn and should not be punished.

Ulrichs was a trained lawyer. In 1854 an inquiry into rumours about his private life led him to resign from the civil service of the Kingdom of Hanover, and in 1859 a court barred him from practising law. He coined 'Urning' for a man who loves men, after Aphrodite Urania, the 'heavenly' Aphrodite of Plato's Symposium. Police in Saxony and Prussia had already seized and banned his pamphlets. In 1871 Paragraph 175 of the new German Empire's penal code made sex between men a crime nationwide. Ulrichs moved to Italy in 1880, settled in L'Aquila and published a journal in Latin until his death in 1895. He is often described as the first gay man to speak out publicly for gay rights, and streets in Munich, Berlin, Bremen and Hanover bear his name.

Karl Heinrich Ulrichs, emancipation writings and Munich jurists' congressRead card

WonderScience

The Svalbard Global Seed Vault, dug into a mountain on a Norwegian Arctic island, stores duplicate seed samples from genebanks around the world. The original collections stay in use elsewhere; Svalbard is the safety copy.

A genebank keeps seeds of crop varieties and their wild relatives so that breeders and researchers can use them. The Svalbard vault opened on 26 February 2008 and is run jointly by the Norwegian government, the Crop Trust and the Nordic Genetic Resource Center (NordGen). The seeds are kept at about -18°C, and depositors keep ownership under a 'black box' system: only the institution that deposited a box can open or withdraw it. The backup has been needed. When the war in Syria cut off the main genebank of the international research centre ICARDA near Aleppo, ICARDA withdrew samples from Svalbard in 2015, and again in 2017, to rebuild its collection in Lebanon and Morocco. These remain the only withdrawals.

NordGen / Crop TrustRead card

WonderTechnology

Some crystals, such as quartz, produce an electric charge when squeezed. This is the piezoelectric effect, discovered in 1880 by the brothers Pierre and Jacques Curie, years before Pierre's research on radioactivity with Marie Curie. It makes the spark when you press the button of a gas lighter.

'Piezo' comes from the Greek word for 'press'. The effect also works in reverse, as the physicist Gabriel Lippmann predicted in 1881 and the Curies soon confirmed: an electric voltage makes the crystal change shape very slightly. That reverse effect keeps time in quartz watches, where a tiny quartz crystal vibrates 32,768 times a second, and it produces and detects the sound pulses of sonar and medical ultrasound. Pierre married Marie Skłodowska in 1895; together they discovered polonium and radium and shared the 1903 Nobel Prize in Physics with Henri Becquerel. Jacques became a professor of mineralogy at Montpellier.

Pierre Curie & Jacques Curie, 1880Read card

WonderHealth

The stethoscope began in 1816 with a roll of paper. French physician René Laennec, examining a young woman, thought it unsuitable to press his ear to her chest, so he rolled paper into a tube and found that heart sounds travelled through it clearly. He later made a wooden version and called the method mediate auscultation, meaning listening through an instrument.

Laennec called his method 'mediate auscultation' because the instrument stood between his ear and the patient, unlike direct auscultation, in which a doctor listened with an ear right on the chest. He soon replaced the rolled paper with a hollow wooden cylinder about 25 cm long, a shape doctors kept using for decades. The word stethoscope comes from the Greek stethos, chest, and skopein, to examine. Laennec spent years comparing the sounds he heard in living patients with what autopsies later showed, laying the foundations of a diagnostic method still used today. He died of tuberculosis in 1826, aged 45; his nephew is said to have diagnosed the disease with Laennec's own stethoscope.

René Laennec, Paris, 1816Read card

WonderLanguage

Yakamoz is the Turkish word for the glitter that appears in dark seawater when fish, oars or waves stir it. The light comes from tiny marine organisms that glow when disturbed.

The word came into Turkish from Greek, and the Turkish Language Association's dictionary gives it two meanings: the glitter made in the sea by moving fish or oars, and the drifting sea creature that gives off light when something touches it. That creature is most often Noctiluca scintillans, a single-celled plankton known in English as sea sparkle. One alone is invisible, but millions together make a boat's wake shine. Light made by a living thing is called bioluminescence. Many people use yakamoz for moonlight shimmering on the water, yet the real thing is easiest to see on dark, moonless nights, because moonlight and city lights drown it out.

Turkish languageRead card

WonderEngineering

Near the top of Taipei 101 hangs a 660-tonne steel sphere that swings against the tower's sway in strong wind, so people inside feel much less movement. Engineers call this device a tuned mass damper.

Taipei 101, a 508-metre skyscraper in Taiwan's capital, opened in 2004. Its gold-painted sphere is 5.5 metres across and hangs from the 92nd down to the 88th floor, where visitors can see it. The ball is tuned to the tower's own natural rhythm of swaying but moves out of step with it, so each push of the wind is partly cancelled, while hydraulic dampers turn the motion into heat. It can reduce the building's movement by up to 40 per cent. During Typhoon Soudelor in August 2015 the ball swung a record one metre. Smaller tuned dampers steady bridges, chimneys and power lines; London's Millennium Bridge was fitted with them after it wobbled under crowds when it opened in 2000.

Tuned mass damperRead card

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