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 man (2nd L) takes pictures as visitors run away from a wave caused by a tidal bore which surged past a barrier on the banks of Qiantang River, in Hangzhou, Zhejiang province August 14, 2014. (Photo by Reuters/Stringer)

An installation of Canadian artists Caitlind Brown and Wayne Garrett is displayed during the Lumina Light Festival in Cascais September 14, 2014. Lumina Light Festival shows artworks of artists from several countries, which are displayed during a tour around Cascais. (Photo by Rafael Marchante/Reuters)

A Midshipmen from the Naval Academy eyes the Navy mascot behind her before the first half of the the 125th Army-Navy game at Northwest Stadium in Landover, Maryland, on December 14, 2024. (Photo by Danny Wild/USA TODAY Sports)

Cast member Pom Klementieff poses on the red carpet during arrivals for the screening of the film “Mission: Impossible – The Final Reckoning” Out of competition at the 78th Cannes Film Festival in Cannes, France, May 14, 2025. (Photo by Stephane Mahe/Reuters)

People watch as a young Palestinian performs an acrobatic jump on the beach, during soaring summer temperatures in Gaza City on June 14, 2024, amid the ongoing conflict between Israel and the Palestinian Hamas militant group. (Photo by Omar Al-Qattaa/AFP Photo)

A man is reflected in the water as he sleeps on the street in Kathmandu, Nepal, 27 June 2023. Despite the Meteorological Forecasting Division of Nepal already announcing the onset of the monsoon season in the country on June 14, 2023, the monsoon rainfall has not been significantly active yet. (Photo by Narendra Shrestha/EPA)

A vendor sells Guy Fawkes masks and items with the colors of the national flag at a market ahead of Independence Day celebrations in Karachi, Pakistan, 13 August 2023. Pakistan celebrates its 76th independence anniversary from British rule in 1947 on 14 August 2023. (Photo by Shahzaib Akber/EPA/EFE)