A Malaysian Royal Guard wears a protective mask while he stands guard outside National Palace, following the outbreak of a new coronavirus in China, in Kuala Lumpur, Malaysia, February 10, 2020. (Photo by Lim Huey Teng/Reuters)

Aerialist Erin Blaire, 33, performs a hair hanging trick for a photographer while hanging from a metal bar on a subway platform on March 14, 2023 in New York City. Erin Blaire, originally from Vermont, has lived in New York City for eight years and has been performing her aerial hair routine for the last three. The origin of hair hanging is believed to have originated in China, according to reports, and is a closely guarded circus trick passed from mentor to mentee. Although it is possible to find the technique and secrets online it is most-likely not how professional performers learned the skillset, and not how Blaire did either. (Photo by Alexi Rosenfeld/Getty Images)

The night view of the National Assembly Building and Yeouido in Yeongdeungpo District, Seoul taken on the December 27, 2024. The lights shine in a cross shape thanks to the cross filter used. (Photo by Koh Woon-ho)

A man dressed as Pothuraju, a mythical character, performs rituals during the Bonalu festival in Hyderabad, India, Thursday, June 30, 2022. Bonalu is a month-long Hindu folk festival of the Telangana region dedicated to Kali, the Hindu goddess of destruction. (Photo by Mahesh Kumar A./AP Photo)

People watch a brig with scarlet sails floating on the Neva River during the Scarlet Sails festivities marking school graduation in St. Petersburg, Russia, early Saturday, June 25, 2022. (Photo by Dmitri Lovetsky/AP Photo)

People cool off by diving into a swimming pool on a hot summer day in Amritsar, India, on June 8, 2025. (Photo by Narinder Nanu/AFP Photo)

Tao Xiangli gets out of his homemade submarine after operating it in a lake on the outskirts of Beijing September 3, 2009. Amateur inventor Tao, 34, made a fully functional submarine, which has a periscope, depth control tanks, electric motors, manometer, and two propellers, from old oil barrels and tools which he bought at a second-hand market. He took 2 years to invent and test the submarine which costs 30,000 yuan ($4,385). (Photo by Christina Hu/Reuters)

“Igor Sikorsky (May 25, 1889 – October 26, 1972), born Igor Ivanovich Sikorsky was a Russian American pioneer of aviation in both helicopters and fixed-wing aircraft. He designed and flew the world's first multi-engine fixed-wing aircraft, the Russky Vityaz in 1913, and the first airliner, Ilya Muromets, in 1914. After immigrating to the United States in 1919, Sikorsky founded the Sikorsky Aircraft Corporation in 1923, and developed the first of Pan American Airways' ocean-conquering flying boats in the 1930s. In 1939 Sikorsky designed and flew the Vought-Sikorsky VS-300, the first viable American helicopter, which pioneered the rotor configuration used by most helicopters today. Sikorsky would modify the design into the Sikorsky R-4, which became the world's first mass-produced helicopter in 1942”. – Wikipedia

Photo: Westland Sikorsky H-5's, used by British European Airways Helicopters, which fly between London and Birmingham. The Sikorsky H-5, (aka R-5, S-51, HO3S-1, or Horse) (R-5 until 1948; company designation VS-327) is a helicopter built by Sikorsky Aircraft Corporation, formerly used by the United States Air Force, and its predecessor, the United States Army Air Forces, as well as the United States Navy and United States Coast Guard (with the designations HO2S and HO3S). (Photo by Harrison /Topical Press Agency/Getty Images). 22nd May 1951