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June 4 · Code Media Labs Almanac
1988

RDX (Research Department Explosive or Royal Demolition Explosive), or hexogen, also known by other names, is an organic compound with the formula (CH2N2O2)3. It is white, odorless, tasteless, and widely used as an explosive. Chemically, it is classified as a nitroamine alongside HMX. It was used widely in World War II and remains common in military applications. It is lower performing and more toxic than modern replacements like TKX-50.
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RDX

Three cars on a train carrying hexogen to Kazakhstan explode in Arzamas, Gorky Oblast, USSR, killing 91 and injuring about 1,500.
RDX (Research Department Explosive or Royal Demolition Explosive), or hexogen, also known by other names, is an organic compound with the formula (CH2N2O2)3. It is white, odorless, tasteless, and wide...
June 4 · Code Media Labs Almanac
1989
An election for the second supreme leader of Iran was held on 4 June and 6 August 1989 following the death of the first supreme leader Ruhollah Khomeini.
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1989 Iranian supreme leader election
In the 1989 Iranian supreme leader election, Ali Khamenei is elected as the new Supreme Leader of Iran after the death and funeral of Ruhollah Khomeini.
An election for the second supreme leader of Iran was held on 4 June and 6 August 1989 following the death of the first supreme leader Ruhollah Khomeini.
June 4 · Code Media Labs Almanac
1989

Protests led by students and workers, known in China as the June Fourth Incident, were held in Tiananmen Square in Beijing, China, from 15 April to 4 June 1989. After weeks of unsuccessful attempts between the demonstrators and the Chinese government to find a peaceful resolution, the Chinese government initiated martial law in late May and deployed troops to occupy the square on the night of 3 June in what is referred to as the Tiananmen Square massacre. The events are sometimes called the '89 Democracy Movement, the Tiananmen Square Incident, or the Tiananmen uprising. The Chinese government terms the events the political turmoil between the spring and summer of 1989.
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1989 Tiananmen Square protests and massacre

The 1989 Tiananmen Square protests are suppressed in Beijing by the People's Liberation Army, with between 241 and 10,000 dead (an unofficial estimate).
Protests led by students and workers, known in China as the June Fourth Incident, were held in Tiananmen Square in Beijing, China, from 15 April to 4 June 1989. After weeks of unsuccessful attempts be...
June 4 · Code Media Labs Almanac
1989
Solidarity, full name Independent Self-Governing Trade Union "Solidarity", is a Polish trade union founded in August 1980 at the Lenin Shipyard in Gdańsk, Poland. Subsequently, it was the first independent trade union in a Warsaw Pact country to be recognised by the state.
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Solidarity (Polish trade union)
Solidarity's victory in the 1989 Polish legislative election occurs, the first election since the Communist Polish United Workers' Party abandoned its monopoly of power. It sparks off the Revolutions of 1989 in Eastern Europe.
Solidarity, full name Independent Self-Governing Trade Union "Solidarity", is a Polish trade union founded in August 1980 at the Lenin Shipyard in Gdańsk, Poland. Subsequently, it was the first indepe...
June 4 · Code Media Labs Almanac
1989

The Ufa train disaster was a railway accident that occurred in the Iglinsky District of the Bashkir ASSR, Soviet Union on 4 June 1989, killing 575 people and injuring 800 more. It is the second-deadliest rail disaster in Soviet/Russian history after the 1944 Vereshchyovka train disaster, and the deadliest to occur during peacetime.
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Ufa train disaster

Ufa train disaster: A natural gas explosion near Ufa, Russia, kills 575 as two trains passing each other throw sparks near a leaky pipeline.
The Ufa train disaster was a railway accident that occurred in the Iglinsky District of the Bashkir ASSR, Soviet Union on 4 June 1989, killing 575 people and injuring 800 more. It is the second-deadli...
June 4 · Code Media Labs Almanac
1996

Ariane 5 is a retired European heavy-lift space launch vehicle operated by Arianespace for the European Space Agency (ESA). It was launched from the Guiana Space Centre (CSG) in French Guiana. It was used to deliver payloads into geostationary transfer orbit (GTO), low Earth orbit (LEO) or further into space. The launch vehicle had a streak of 82 consecutive successful launches between 9 April 2003 and 12 December 2017. In development since 2014, Ariane 6, a direct successor system was first launched in 2024.
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Ariane 5

The first flight of Ariane 5 explodes after roughly 37 seconds. It was a Cluster mission.
Ariane 5 is a retired European heavy-lift space launch vehicle operated by Arianespace for the European Space Agency (ESA). It was launched from the Guiana Space Centre (CSG) in French Guiana. It was...
June 4 · Code Media Labs Almanac
2005
The Civic Forum of the Romanians of Covasna, Harghita and Mureș is a forum grouping some 45 organizations of Covasna, Harghita and Mureș counties in Romania as of 2022. These counties have a large ethnically Hungarian population made up of the Székely subgroup, although ethnic Romanians also live in them. The FCRCHM was founded on 4 June 2005 and aims to organize the ethnic Romanian population in these counties to prevent its disappearance; for this purpose, it has organized various events and initiatives.
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Civic Forum of the Romanians of Covasna, Harghita and Mureș
The Civic Forum of the Romanians of Covasna, Harghita and Mureș is founded.
The Civic Forum of the Romanians of Covasna, Harghita and Mureș is a forum grouping some 45 organizations of Covasna, Harghita and Mureș counties in Romania as of 2022. These counties have a large et...
June 4 · Code Media Labs Almanac
2010

The Dragon Spacecraft Qualification Unit was a boilerplate version of the Dragon spacecraft manufactured by SpaceX. After using it for ground tests to rate Dragon's shape and mass in various tests, SpaceX launched it into low Earth orbit on the maiden flight of the Falcon 9 rocket, on June 4, 2010. SpaceX used the launch to evaluate the aerodynamic conditions on the spacecraft and performance of the carrier rocket in a real-world launch scenario, ahead of Dragon flights for NASA under the Commercial Orbital Transportation Services program. The spacecraft orbited the Earth over 300 times before decaying from orbit and reentering the atmosphere on 27 June.
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Dragon Spacecraft Qualification Unit

Falcon 9 Flight 1 is the maiden flight of the SpaceX Falcon 9 rocket, which launches from Cape Canaveral Air Force Station Space Launch Complex 40.
The Dragon Spacecraft Qualification Unit was a boilerplate version of the Dragon spacecraft manufactured by SpaceX. After using it for ground tests to rate Dragon's shape and mass in various tests, Sp...
June 4 · Code Media Labs Almanac
2020

The death of Giovanni López Ramírez occurred on 4 May 2020, in the municipality of Ixtlahuacán de los Membrillos, Jalisco, Mexico as a result of his arrest by police officers. He was allegedly arrested for not wearing a face mask during the COVID-19 pandemic in Mexico. He died at a hospital with traumatic brain injury and with a gunshot wound to his leg. Public outcry over his death erupted one month later, due to a video of his arrest going viral on social media and inspired by the George Floyd protests. Protests against police brutality began in Jalisco on 4 June 2020, and spread to other areas in Mexico.
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Death of Giovanni López

Death of Giovanni López: Protests over the death of Giovanni López Ramírez, who had died on 4 May while in custody, begin in Jalisco following the release of a video of his arrest going viral on social media, and inspired by the George Floyd protests. Later, these spread across Mexico.
The death of Giovanni López Ramírez occurred on 4 May 2020, in the municipality of Ixtlahuacán de los Membrillos, Jalisco, Mexico as a result of his arrest by police officers. He was allegedly arreste...
June 4 · Code Media Labs Almanac
2023
On June 4, 2023, a series of planned anti-government marches took place in several areas of Poland, with the main one being held in the capital city of Warsaw. The protests were additionally motivated by the passing of the bill commonly referred to as "Lex Tusk", which critics argued would disrupt the constitutional separation of powers by giving the ruling party of PiS excessive judicial oversight. The Polish opposition in the national Parliament, as well as numerous foreign commentators, considered the law's approval an extension of the perceived constitutional crisis under the presidency of Andrzej Duda and the government headed by Prime Minister Mateusz Morawiecki.
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2023 Polish protests
Protests begin in Poland against the PiS government.
On June 4, 2023, a series of planned anti-government marches took place in several areas of Poland, with the main one being held in the capital city of Warsaw. The protests were additionally motivated...
June 4 · Code Media Labs Almanac
2023

The Cessna Citation V is a business jet built by Cessna as part of the Cessna Citation family. The first Model 560 prototype, a stretched version of the Citation S/II, flew in August 1987 and was certified on December 9, 1988. The upgraded Citation Ultra was announced in September 1993; the Citation Encore, upgraded with PW535 turbofans, was announced in 1998 and later upgraded as the Encore+. Between 1989 and 2011, 774 of all variants were produced. Its U.S. military designation is UC-35 as an executive transport and OT-47B as a reconnaissance aircraft.
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Cessna Citation V

Four people are killed when a Cessna Citation V crashes into Mine Bank Mountain in Augusta County, Virginia.
The Cessna Citation V is a business jet built by Cessna as part of the Cessna Citation family. The first Model 560 prototype, a stretched version of the Citation S/II, flew in August 1987 and was cert...
June 4 · Code Media Labs Almanac
2025

Crowd collapses and crowd crushes are catastrophic incidents that occur when a body of people becomes dangerously overcrowded. When numbers are up to about five people per square meter, the environment may feel cramped but manageable; when numbers reach between eight and ten people per square meter, individuals become pressed against each other and may be swept along against their will by the motion of the crowd. Under these conditions, the crowd may undergo a progressive collapse where the pressure pushes people off their feet, resulting in people being trampled or crushed by the weight of other people falling on top of them. At even higher densities, the pressure on each individual can cause them to be crushed or asphyxiated while still upright.
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Crowd collapses and crushes

Eleven people are killed and 56 people are injured during a crowd crush incident outside M. Chinnaswamy Stadium in Bengaluru, India for the celebration of Royal Challengers Bengaluru's Indian Premier League victory.
Crowd collapses and crowd crushes are catastrophic incidents that occur when a body of people becomes dangerously overcrowded. When numbers are up to about five people per square meter, the environmen...
June 4 · Code Media Labs Almanac
1993

Jonathan Huberdeau, Canadian ice hockey player
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Jonathan Huberdeau

Jonathan Huberdeau, Canadian ice hockey player
June 4 · Code Media Labs Almanac
1996

Oli McBurnie, Scottish footballer
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Oli McBurnie

June 4 · Code Media Labs Almanac
1998

Central Cee, British rapper and songwriter
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Central Cee

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