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 checks his mobile phone near overturned shipping containers after explosions hit the Binhai new district, Tianjin, August 13, 2015. A huge explosion hit an industrial area in the northeastern Chinese city of Tianjin late on Wednesday evening, triggering a blast wave felt several kilometres away and injuring at least 50 people, domestic media reported. (Photo by Reuters/Stringer)

Crowds look on as the super moon rises behind the Fremantle War Memorial at Monument Hill on November 14, 2016 in Fremantle, Australia. A super moon occurs when a full moon passes closes to earth than usual, with the November 14th moon expected to be closer than it has been in over 70 years. (Photo by Paul Kane/Getty Images)

A man walks along an El Paso road while observing a large ash column from the Cumbre Vieja volcano on the Canary Island of La Palma, Spain, October 4, 2021. (Photo by Borja Suarez/Reuters)

Afghan children enjoy their time on Nadir Khan hill during the first day of Eid al-Fitr in Kabul, Afghanistan, Friday, April 21, 2023. (Photo by Ebrahim Noroozi/AP Photo)

The Indian community and supporters living in Brazil celebrate the festival of colors in Sao Paulo, Brazil on March 24, 2024. A Burst of Colors and Tradition Holi, characterized by vivid hues, gulaal, and rituals, transcends mere festivity; it's a grand jubilation of joy and camaraderie. Legend has it that the festival commemorates the triumph of Lord Narasimha over the demon Hiranyakashyap, representing the victory of righteousness over malevolence. (Photo by Dario Oliveira/ZUMA Press Wire/Rex Features/Shutterstock)

One-day-old baby giraffe calf Gus looks at the camera at Noah's Ark farm on May 12, 2017 in Bristol, England. The baby giraffe was born yesterday at the zoo farm in North Somerset. In the wild, populations of giraffes are suffering from a continuing decline, with 97,500 estimated in Africa in 2015. Since 1985 the total giraffe population has fallen by 35%. New arrival Gus joins brothers George, 4 and Geoffrey, 2. (Photo by Matt Cardy/Getty Images)

Nosy neighbour by Sam Hobson, UK. Sam knew exactly who to expect when he set his camera on the wall one summer’s evening in a suburban street in Bristol, the UK’s famous fox city. He wanted to capture the inquisitive nature of the urban red fox in a way that would pique the curiosity of its human neighbours about the wildlife around them. (Photo by Sam Hobson/2016 Wildlife Photographer of the Year)