1988

RDX

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

1989

1989 Iranian supreme leader election

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

1989

1989 Tiananmen Square protests and massacre

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

1989

Solidarity (Polish trade union)

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)

1989

Ufa train disaster

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

1996

Ariane 5

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

2005

Civic Forum of the Romanians of Covasna, Harghita and Mureș

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

2010

Dragon Spacecraft Qualification Unit

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

2020

Death of Giovanni López

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

2023

2023 Polish protests

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

2023

Cessna Citation V

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

2025

Crowd collapses and crushes

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

1993

Birth of Jonathan Huberdeau

Jonathan Huberdeau, Canadian ice hockey player

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Jonathan Huberdeau

1996

Birth of Oli McBurnie

Oli McBurnie, Scottish footballer

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Oli McBurnie

1998

Birth of Central Cee

Central Cee, British rapper and songwriter

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Central Cee