Riot police detain a woman during a protest near Mong Kok police station in Hong Kong, China on September 7, 2019. (Photo by Tyrone Siu/Reuters)

A photo taken on July 22, 2017 shows beach- goers dancing at the West Sea Barrage beach outside the coastal city of Nampo, southwest of Pyongyang. The West Sea Barrage beach features as a stopping point for foreign tourists, and is a destination for North Korean work groups from the neighbouring area. The beach lies at the end of an eight- kilometre- long barrage that separates the sea from the Taedong River, which runs through Pyongyang. (Photo by Ed Jones/AFP Photo)

Revellers take part in an annual block party known as “Cordao de Prata Preta”, one of the many carnival parties to take place in the neighbourhoods of Rio de Janeiro, February 6, 2016. (Photo by Pilar Olivares/Reuters)

Steve Jobs, CEO of Apple, attends the Macworld Conference and Expo July 18, 2001 in New York City. (Photo by Mario Tama/Getty Images)

A child attends a training session in a swimming pool on July 10, 2007 in Wuhan of Hubei Province, China. (Photo by China Photos/Getty Images)

A Ukrainian serviceman of the 47th “Magura” Separate Mechanized Brigade plays with a cat, which his unit evacuated from a frontline, amid Russia's attack on Ukraine, at undisclosed location in Donetsk region, Ukraine on February 8, 2024. (Photo by Alina Smutko/Reuters)

Fire and smoke erupt from a building just after an Israeli airstrike in Beirut's southern Shayah neighbourhood on November 22, 2024, amid the ongoing war between Israel and Hezbollah. (Photo by AFP Photo/Stringer)

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)