History puzzle · June 27, 2026

20th-century firsts

The tightly-packed century

Difficulty ★★★★★ · 10 events

In Hand of History for June 27, 2026 you place these 10 real events back into the order they happened. Here they are in chronological order, with the date revealed and why each one matters.

1926

Robert Goddard launches the world's first liquid-fueled rocket from a snow-covered cabbage field in Auburn, Massachusetts.

The entire flight lasts just 2.5 seconds and travels 41 feet — about the length of a school bus — yet Goddard is already calculating trajectories to the Moon.

Robert Goddard's flight of the first liquid-fueled rocket proves that controlled, self-sustaining rocketry is possible, laying the groundwork for the Space Age.

1940

DuPont puts nylon stockings on sale across the United States for the very first time.

American women buy 64 million pairs in the first year alone — roughly one pair per adult woman in the country.

The first mass-market synthetic fibre product sparks a consumer frenzy and signals the dawn of the plastics age.

1946

French engineer Louis Réard unveils the bikini at a Paris poolside fashion show.

No professional model will wear it, so Réard hires a nude dancer from the Casino de Paris to debut the two-piece instead.

The bikini's debut shocks postwar fashion and rewrites the rules of swimwear.

First stored-program computer runs its first program — 1948
1948

The Manchester Baby runs the world's first stored program, a simple mathematical calculation, at the University of Manchester.

The program searches for the highest factor of a number and takes 52 minutes to find it — a task any pocket calculator now does instantly.

The Manchester Baby, also called the Small-Scale Experimental Machine (SSEM), was the first electronic stored-program computer. It was built at the Victoria University of Manchester by Frederic C. Williams, Tom Kilburn, and Geoff Tootill, and ran its first program on 21 June 1948.

📷 Wikimedia Commons

1950

Frank McNamara launches the Diners Club card — the first general-purpose charge card — in New York City.

The idea reportedly strikes McNamara after he forgets his wallet at a restaurant dinner, forcing his wife to rush over with cash to pay the bill.

Diners Club International Ltd. (DCI), founded as Diners Club, is a charge card company owned by Capital One. Formed in 1950 by Frank X. McNamara, Ralph Schneider (1909–1964), Matty Simmons, and Alfred S. Bloomingdale, it was the first independent payment card company in the world, successfully establishing the financial card service of issuing travel and entertainment (T&E) credit cards as a viable business. Diners Club International and its franchises serve members globally, with acceptance in over 200 countries and territories. As of 2024–2025, the network includes more than 55 card issuers operating in approximately 45 countries.

The US detonates the first hydrogen bomb — 1952
1952

The United States detonates Ivy Mike, the first full-scale thermonuclear weapon, on Enewetak Atoll in the Pacific.

The explosion vaporises the entire island of Elugelab, leaving a crater 164 feet deep and nearly a mile wide where solid land had been.

Ivy Mike was the codename given to the first full-scale test of a thermonuclear device, in which a significant fraction of the explosive yield comes from nuclear fusion. Ivy Mike was detonated on November 1, 1952, by the United States on the island of Elugelab in Enewetak Atoll, in the now independent island nation of the Marshall Islands, as part of Operation Ivy. It was the first full test of the Teller–Ulam design, a staged fusion device.

📷 Wikimedia Commons

US detonates the first hydrogen bomb — 1952
1952

The United States detonates 'Ivy Mike,' the world's first thermonuclear device, at Enewetak Atoll in the Pacific.

The blast vaporises the entire island of Elugelab — a piece of land about 1,500 feet wide simply ceases to exist.

Ivy Mike was the codename given to the first full-scale test of a thermonuclear device, in which a significant fraction of the explosive yield comes from nuclear fusion. Ivy Mike was detonated on November 1, 1952, by the United States on the island of Elugelab in Enewetak Atoll, in the now independent island nation of the Marshall Islands, as part of Operation Ivy. It was the first full test of the Teller–Ulam design, a staged fusion device.

📷 Wikimedia Commons

Hillary and Tenzing summit Mount Everest — 1953
1953

Edmund Hillary and Tenzing Norgay become the first people confirmed to reach the summit of Mount Everest.

Hillary photographs Tenzing on the summit but Tenzing does not photograph Hillary — Tenzing has never used a camera before in his life.

The 1953 British Mount Everest expedition was the ninth mountaineering expedition to attempt the first ascent of Mount Everest, and the first confirmed to have succeeded when Tenzing Norgay and Edmund Hillary reached the summit on 29 May 1953 at 11:30 a.m. Led by Colonel John Hunt, it was organised and financed by the Joint Himalayan Committee. News of the expedition's success reached London in time to be released on the morning of Queen Elizabeth II's coronation, on 2 June that year.

📷 Wikimedia Commons

First nuclear power plant opens — 1956
1956

Britain opens Calder Hall in Cumberland, the world's first full-scale nuclear power station to supply a national grid.

The plant is officially opened by Queen Elizabeth II, who flips a switch — but engineers later admit the grid connection had already been live for weeks during testing.

Calder Hall Nuclear Power Station is a former Magnox nuclear power station on the Sellafield site in Cumbria in North West England. Calder Hall was the first full-scale nuclear power station to enter operation in the West, and was the sister plant to the Chapelcross plant in Scotland. Both were commissioned and originally operated by the United Kingdom Atomic Energy Authority. The primary purpose of both plants was to produce weapons-grade plutonium for the UK's nuclear weapons programme, but they also generated electrical power for the National Grid.

📷 Wikimedia Commons

First nuclear electricity sold to the public — 1957
1957

The Shippingport Atomic Power Station in Pennsylvania begins selling nuclear electricity to ordinary homes.

It is so small by later standards that its entire reactor vessel was shipped to the site by barge up the Ohio River.

The Shippingport Atomic Power Station was the world's first full-scale atomic electric power plant devoted exclusively to peacetime uses. It was located near the later Beaver Valley Nuclear Generating Station on the Ohio River in Beaver County, Pennsylvania, United States, about 25 miles (40 km) from Pittsburgh.

📷 Wikimedia Commons

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