People make a heart shaped gesture as they look at the first sunrise of the year during New Year's celebrations at a park on January 1, 2023 in Seoul, South Korea. Seoul's New Years celebrations returns this year after it was cancelled during the Covid Pandemic. (Photo by Chung Sung-Jun/Getty Images)

The Swiss Air Force Patrouille Suisse aerobatic team performs during the men's downhill race at the Alpine Skiing FIS Ski World Cup in Wengen, Switzerland, Saturday, January 19, 2019. (Photo by Anthony Anex/Keystone via AP Photo)

A woman walks in the Zaryadye Park, with a Soviet era skyscraper seen in the background, during a sunny day in Moscow, Russia on April 21, 2025. (Photo by Evgenia Novozhenina/Reuters)

Artillerymen of the Ukrainian 80th separate airborne assault brigade fire from a BM-21 Grad multiple rocket launcher towards Russian positions on the front line near Bakhmut in the Donetsk region, on April 18, 2023, amid the Russian invasion of Ukraine. (Photo by Anatolii Stepanov/AFP Photo)

A girl jumps over a campfire while celebrating Ivan Kupala Night, a traditional Slavic holiday not far from Kiev on July 6, 2013. During the celebration, originating in pagan times, people plait wreaths, jump over fires, and swim naked. (Photo by Sergei Supinsky/AFP Photo)

Brazilian singer Larissa de Macedo Machado, better known by her stage name Anitta performs at the Coachella Music & Arts Festival at the Empire Polo Club on Friday, April 22, 2022, in Indio, Calif. (Photo by Amy Harris/Invision/AP Photo)

A Chinese tourist uses the scarf of a friend as she is helped while she and others struggle to climb in the wind on an icy section of the Great Wall at Badaling, on a cold day after a snowfall on November 30, 2019 in Beijing, China. (Photo by Kevin Frayer/Getty Images)

The lightest material ever made has been produced by a team of scientists in China, a Chinese university announced.