Brain-on-a-chip. Dazzling in green and magenta this image shows the nerve fibres (in green) produced by neural stem cells (in magenta) as they grow on a synthetic gel. Captured by a technique known as confocal microscopy, the image is part of research shedding light on how tinkering with the environment can affect the way in which nerve fibres grow. (Photo by Collin Edington and Iris Lee/Massachusetts Institute of Technology/Wellcome Images)

Daniel Fox inside the Mendenhall Glacier, in September 2014, in Juneau, Alaska. Driving in an open-roofed jeep is no longer the fashionable way to see wildlife – as this adventurer shows. A keen wildlife photographer has circled islands in the south of Alaska, the United States, in a kayak to see spectacular scenery and animals. Daniel Fox, 40, from San Francisco spent three months travelling around the islands by kayak, meeting sea lions and brown bears along the way. (Photo by Daniel Fox/Barcroft Media)

Collin Williams (front) and Sarah Putnam of Nevada, protesters affiliated with the Occupy Las Vegas movement, participate in a “zombie walk” on the Las Vegas Strip October 30, 2011 in Las Vegas, Nevada. The demonstrators are protesting what they believe is greed and corruption among banking and business leaders in solidarity with other Occupy movements around the world. (Photo by Ethan Miller/Getty Images)

A person walks their dog in the morning mist at sunrise in Greenwich Park in south London on November 9, 2020. (Photo by Daniel Leal-Olivas/AFP Photo)

Actress Elke Sommer sunbathing on the beach of Cannes during the Cannes film festival, 1961. (Photo by Daniel Fallot/INA via Getty Images)

Danielle Sellers attends The Beauty Awards at Tower of London on November 28, 2017 in London, England. (Photo by Lia Toby/WENN)

Daniel Lismore arrives for the Brit Awards at the O2 Arena in London, Britain, February 20, 2019. (Photo by Peter Nicholls/Reuters)

An Afghan girl jumps off the wall of a small cemetery in Kandahar on July 29, 2022. (Photo by Daniel Leal/AFP Photo)