Revellers take part in the annual “Naval Battle” of Vallecas in Madrid, Spain July 19, 2015. The slogan for this year's water battle is “Get wet for Alfon, freedom for Alfon”, referring to Alfonso Fernandez Ortega, a Vallecas resident who was sentenced to four years in prison in June. The festival was started spontaneously in 1981 when some neighbours started to throw water at one another due to high temperatures during the Virgen del Carmen Festival. (Photo by Juan Medina/Reuters)

“Contrails (short for “condensation trails”) or vapour trails are artificial clouds that are the visible trails of condensed water vapour made by the exhaust of aircraft engines. As the hot exhaust gases cool in the surrounding air they may precipitate a cloud of microscopic water droplets or, if the air is cold enough, tiny ice crystals”. – Wikipedia

Photo: An airplane leaves a vapor trail as it flies in front of he moon on January 17, 2007 above Hanover, Germany. (Photo by Alexander Hassenstein/Getty Images)

Members of the public take to the water at Barassie Beach in Troon, on the west coast of Scotland on Boxing Day, December 26, 2020 as Storm Bella brings rain and high winds to the UK. (Photo by Andy Buchanan/AFP Photo)

A resident pushes their motorbike through flood waters caused by torrential rain in Semarang, central Java, Indonesia on February 23, 2021. (Photo by W.F. Sihardian/NurPhoto/Rex Features/Shutterstock)

The king penguin in his moulting suit joins his waddle on their way to the water despite not being waterproof yet at Volunteer Point on the Falkland Islands, 2023. (Photo by Judy Rogero/Media Drum Images)

A Chinese tourist plays with water as she celebrates during the Songkran holiday which marks the Thai New Year in Bangkok, Thailand on April 13, 2023. (Photo by Chalinee Thirasupa/Reuters)

People take part in mass water fights during the first day of Songkran, or Thai New Year, on Khao San Road in Bangkok on April 13, 2023. (Photo by Lillian Suwanrumpha/AFP Phoot)

Lucy Blacker from Australia takes to the water at the 40 Foot for a Christmas Day Swim in Ireland on December 25, 2022. (Photo by Alan Betson/The Irish Times)