British Gas engineer Martin Caulfield, 69, services and cleans a gas lamp in front of Big Ben on October 31, 2011 in London, England. Caulfield has been looking after the traditional lights since 1982. There are still around 1600 left in the capital. (Photo by Matthew Lloyd/Getty Images)

A coil-shaped Helix Nebula showing a fine web of filamentary “bicycle-spoke” features embedded in the colorful red and blue ring of gas. At 650 light-years away, the Helix is one of the nearest planetary nebulae to Earth. A planetary nebula is the glowing gas around a dying, Sun-like star. (Photo by Reuters/NASA)

Dancers at the Windmill Theatre in London, England practice a routine wearing gas masks and hard-hats with their costumes, 1940. (Photo by Hulton Archive/Getty Images)

Drivers push cars to gas station during “oil crisis”, Roslindale, Boston, Massachusetts, 1973. (Photo by Spencer Grant/Getty Images)

Riot police fire tear gas at demonstrators during a protest against fare hikes for city buses in Sao Paulo, Brazil, January 8, 2016. Brazilian riot police on Friday fired tear gas and stun grenades to disperse a violent protest against a rise in public transport fares in the country's largest city, Sao Paulo. (Photo by Nacho Doce/Reuters)

People assist a woman who was exposed to tear gas by pouring milk over her face after police fired tear gas and water canon to try and disperse protesters outside Parliament on November 17, 2020 in Bangkok, Thailand. The demonstrators gathered outside parliament, on Tuesday, as the Thai government met to discuss amendments to the country's constitution. (Photo by Lauren DeCicca/Getty Images)

Fans of Gimnasia de La Plata choke on tear gas during a local tournament match between Gimnasia de La Plata and Boca Juniors in La Plata, Argentina, Thursday, October 6, 2022. The match was suspended after tear gas thrown by the police outside the stadium wafted inside affecting the players as well as fans who fled to the field to avoid its effects. (Photo by Gustavo Garello/AP Photo)

A supporter of Pakistan Tehreek-e-Insaf (PTI) party gestures after tear gas was fired by the police to disperse the crowd during a protest to demand the release of former prime minister Imran Khan in Islamabad on November 26, 2024. Thousands of protestors calling for the release of Pakistan's jailed ex-prime minister Imran Khan defied roadblocks and tear gas to march to the gates of the nation's capital on November 26. (Photo by Aamir Qureshi/AFP Photo)