Wedges of an orange generate enough current and electrical juice – 3.5 volts – to power an LED. The fruit’s citric acid helps electrons flow from galvanized nails to copper wire in this 14-hour exposure. This image was published in September’s Visions of Earth, a trio of photos that appear in each issue of National Geographic. (Photo by Caleb Charland/National Geographic)

A king eider sea duck tackles a prickly dinner of sea urchin on a lake in Batsfjord, Norway in the last decade of August 2024. The drake’s breeding plumage consists of a distinctive powder-blue head and neck, orange frontal lobe and a red bill. (Photo by Mia Surakka/Solent News)

Construction workers take a lunch break on a steel beam atop the RCA Building at Rockefeller Center, New York, September 29, 1932. In the background is the Chrysler Building. (Photo by AP Photo)

Two scavengers collect plastics in the Citarum river in Bandung, West Java on March 28, 2023. (Photo by Timur Matahari/AFP Photo)

Revellers make the most of Friday night in Soho, central London after the hottest day of the year recorded in the capital this year, June 17, 2022. (Photo by Marcin Nowak/Alamy Live News)

A worker stands next to a Southern Two-toed Sloth at the Sloth and Friends Studio inside Hong Kong Ocean Park on August 3, 2023 in Hong Kong, China. (Photo by Vernon Yuen/Rex Features/Shutterstock)

A wrestling camel adorned with colourful ornaments takes part in the Camel Beauty Contest ahead of the annual 40th Efes Selcuk Camel Wrestling Festival, in the Aegean town of Selcuk, near Izmir, Turkey on January 15, 2022. (Photo by Murad Sezer/Reuters)

A Guarani Mbya man smokes a pipe next to a cut tree as he occupies land as a protest against real estate developer Tenda which plans to build apartment buildings here, next to his indigenous community's land in Sao Paulo, Brazil, Thursday, February 6, 2020. In response to an injunction filed by the builder, a judge has authorized the eviction of the indigenous protesters from the builder's property. (Photo by Andre Penner/AP Photo)