South Sudanese traditional dancers prepare to welcome Pope Francis during his visit in Juba, South Sudan on February 3, 2023. (Photo by Thomas Mukoya/Reuters)

A Kenyan police officer calls for reinforcement in front of a lorry set on fire by protesters during riots in the informal settlement of Kibera in Nairobia on May 2, 2023. Kenyan riot police were out on the streets on May 2, 2023 as the opposition defied a police ban and staged new demonstrations over the cost of living crisis and last year's election results. (Photo by Luis Tato/AFP Photo)

Men skin slaughtered sheep on the first day of the Eid al-Adha Muslim holiday in Wad Hamid, about 100 kilometres north of Sudan's capital, on June 28, 2023. (Photo by AFP Photo/Stringer)

A delegate from the indigenous Maasai community blows a horn and wears an ostrich feathers headgear as he arrives for the Africa Climate Summit (ACS) 2023 at the Kenyatta International Convention Centre (KICC) in Nairobi, Kenya on September 6, 2023. (Photo by Monicah Mwangi/Reuters)

Fashionistas wait for the start of Johannesburg Fashion Week 2023 in Johannesburg, South Africa, Wednesday, November 8, 2023. (Photo by Jerome Delay/AP Photo)

People line the streets as a dragon passes by during the Chinese New Year parade on January 29, 2012 in New York City. Thousands of people turned out to see the event which celebrated the Year of the Dragon. (Photo by John Moore/Getty Images)

Fireworks explode over Elizabeth Tower housing the Big Ben clock in London. (Photo by Kirsty Wigglesworth/Associated Press)

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