Camila Iachini, 8, performs with her bike during celebrations for the 400th anniversary of the founding of the neighbourhood Petare, in Caracas, Venezuela on February 17, 2021. (Photo by Leonardo Fernandez Viloria/Reuters)

Iraqi teenagers swim in waste water from the nearby Tuweitha nuclear facility near Baghdad, Iraq on May 28, 2003. Iraqis are consuming contaminated water unaware of the dangerous pollutants that can cause severe ill health. (Photo by Damir Sagolj/Reuters)

Participants dance during the Water Gun Festival on July 07, 2019 in Seoul, South Korea. Thousands of people enjoyed the annual festival which is being held over the weekend during the scorching heat summer in Korea. (Photo by Chung Sung-Jun/Getty Images)

Women sell bananas in the street, after traders in markets were prohibited from selling any non-food items in an attempt to halt the spread of the new coronavirus, in Kampala, Uganda Thursday, March 26, 2020. (Photo by Ronald Kabuubi/AP Photo)

A boy attends Eid al-Adha prayers on the street outside Abu Hanifa mosque in Baghdad Adhamiya district, during the outbreak of the coronavirus disease (COVID-19), in Iraq, July 31, 2020. (Photo by Thaier Al-Sudani/Reuters)

Cemetery workers lift a corpse from a coffin to a metal plate as they prepare the body for cremation at a cemetery in Maracaibo, Venezuela, November 27, 2019. Some overcome the financial burden of a relative's death by renting caskets, a cheaper option than buying one. (Photo by Rodrigo Abd/AP Photo)

A sadhu, or a Hindu holy man, blesses a devotee as he smokes marijuana at a transit camp on the way to Gangasagar, in Kolkata, India, Sunday, January 7, 2018. Thousands of Hindu pilgrims are expected to take the annual holy dip at Gangasagar, where the Ganges River reaches the Bay of Bengal, on the auspicious Makar Sankranti festival day that falls on Jan. 14. (Photo by Bikas Das/AP Photo)

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