Meanwhile, Maximinus, now declared a public enemy, had already begun to march on Rome with another army. The senate's previous candidates, the Gordians, had failed to defeat him, and knowing that they stood to die if he succeeded, the senate needed a new emperor to defeat him. With no other candidates in view, on 22 April 238, they elected two elderly senators, Pupienus and Balbinus (who had both been part of a special senatorial commission to deal with Maximinus), as joint emperors. Therefore, Marcus Antonius Gordianus Pius, the thirteen-year-old grandson of Gordian I, was nominated as emperor Gordian III, holding power only nominally in order to appease the population of the capital, which was still loyal to the Gordian family.
On April 22, 1793, during the French Revolution, Washington issued his famous Neutrality Proclamation and was resolved to pursue, "a conduct friendly and impartial toward the belligerent Powers" while he warned Americans not to intervene in the international conflict.
Both sides tried to break the stalemate using scientific and technological advances. On 22 April 1915, at the Second Battle of Ypres, the Germans (violating the Hague Convention) used chlorine gas for the first time on the Western Front. Several types of gas soon became widely used by both sides, and though it never proved a decisive, battle-winning weapon, poison gas became one of the most-feared and best-remembered horrors of the war.
In April, the Allies launched an operation to retake Western New Guinea. The Western New Guinea campaign was a series of actions in the New Guinea campaign, the campaign begun on 22 April 1944. Fighting in western New Guinea continued until the end of the war.
On 21 April, Eaton and Murray, joined on 22 April by destroyers USS Conway and USS Cony, plus submarine USS Threadfin and a CIA PBY-5A Catalina flying boat, continued to search the coastline, reefs, and islands for scattered Brigade survivors, about 24–30 being rescued.
On 23 April 1983, the Punjab Police Deputy Inspector General A. S. Atwal was shot dead as he left the Temple compound. The following day, after the murder, Harchand Singh Longowal confirmed the involvement of Bhindranwale in the murder.
On 22 April, near dusk, serious rioting broke out in Changsha and Xi'an. In Xi'an, arson from rioters destroyed cars and houses, and looting occurred in shops near the city's Xihua Gate. In Changsha, 38 stores were ransacked by looters. Over 350 people were arrested in both cities. In Wuhan, university students organized protests against the provincial government. As the situation became more volatile nationally, Zhao Ziyang called numerous meetings of the Politburo Standing Committee (PSC). Zhao stressed three points: discourage students from further protests and ask them to go back to class, use all measures necessary to combat rioting, and open forms of dialogue with students at different levels of government.
Hu's state funeral took place on 22 April. On the evening of 21 April, some 100,000 students marched on Tiananmen Square, ignoring orders from Beijing municipal authorities that the Square was to be closed off for the funeral. The funeral, which took place inside the Great Hall and attended by the leadership, was broadcast live to the students. General secretary Zhao Ziyang delivered the eulogy. The funeral seemed rushed, and only lasted 40 minutes, as emotions ran high in the Square. Students wept.
One campaign that Nike began for Earth Day 2008 was a commercial that featured basketball star Steve Nash wearing Nike's Trash Talk Shoe, which had been constructed in February 2008 from pieces of leather and synthetic leather waste from factory floors. The Trash Talk Shoe also featured a sole composed of ground-up rubber from a shoe recycling program. Nike claims this is the first performance basketball shoe that has been created from manufacturing waste, but it only produced 5,000 pairs for sale.
The company's first product was the highly anticipated OnePlus One. It was unveiled on 22 April 2014, and was claimed as the "2014 Flagship Killer." The One had comparable, and in some ways better, specifications to other flagship phones of the year, while being sold at a significantly lower price at $299 for the 16 GB version or $349 for the 64 GB version.
On 23 April 2015, Xiaomi CEO Lei Jun and VP Hugo Barra came together to announce a new smartphone named Mi 1s in India, the first phone to be launched in India before any other country. The Xiaomi Mi Band was also launched in the same event.