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)

Dog Xiaoniu dressed in clothes walks across a street with its owner (not pictured) in Shanghai, December 19, 2014. According to local media, Xiaoniu accompanies its owner to the food market everyday and is able to walk with its hind legs for up to about an hour. (Photo by Reuters/Stringer)

A worker settles mud in a mold to make bricks at a brick factory in Tixtla, on the outskirts of Chilpancingo, in the Guerrero state, January 26, 2015. The worker earns a salary of 15 Mexican pesos, or one dollar, for every 100 bricks made on a working day of at least 5 hours. (Photo by Jorge Dan Lopez/Reuters)

LA Coroners leave the Beverly Hilton Hotel possibly carrying the body of the singer Whitney Houston in the early hours of February 12, 2012 in Los Angeles, CA. Singer and film star Whitney Houston aged 48 has died in her hotel room at the Beverly Hilton Hotel. (Photo/Toby Canham/Getty Images)

A tattoo of Captain America drawn by artist Sean Karon on the leg of client Ron Raucci at the Hampton Roads Tattoo Festival in Virginia, on March 2, 2012. The tattoo was completed from start to finish in one five-and-a-half hour session and won the prestigious “tattoo of the day” contest. (Photo by Jason Reed/Reuters)

The photographer Yan Hidayat says his pet Pacman frog and Brazilian turtle are inseparable. He still had to wait four hours to get this photo in West Sumatra, Indonesia, in the first decade of March 2024. (Photo by Yan Hidayat/Media Drum Images)

Class of 2027 plebes climb during the Herndon Monument Climb at the U.S. Naval Academy, Wednesday, May 15, 2024, in Annapolis, Md. Freshmen, known as Plebes, participate in the climb to celebrate finishing their first year at the academy. The climb was completed in two hours, nineteen minsters and eleven seconds to complete. (Photo by Tom Brenner/AP Photo)

Picks him up at 25 miles an hour! If the modern auto or truck hits you don't worry. Equipped with this device you are simply given a free ride. This man even came from behind another car, was struck but not even scratched. The demonstration was given recently in Washington, D.C. (1924 December 17). (Photo by Library of Congress)