Luis Hernan was always curious about how wireless technologies like radio are transmitted through the air. So after finishing up his studies in architecture, computer science, and design, Hernan decided to research these invisible signals through a PhD at Newcastle University. Hernan set up a system that turned the wireless signals around him into colourful, ghostlike images using long-exposure photography, allowing people to see the strength of the signals around them. (Photo by Luis Hernan)

In this undated handout photograph from the “Inside Out Project”, a poster bearing the image of a Pakistani girl whose parents, lawyers say, were killed in a drone strike, lies in a field at an undisclosed location in the northwestern Khyber-Pakhtunkhwa province. A group of artists in Pakistan are hoping to generate “empathy” among US drone operators by placing giant posters of children in the country's troubled tribal regions. (Photo by AFP Photo)

Palestinians drive classic cars during a gathering organized by the Bethlehem municipality near the Church of the Nativity in Manger Square in Bethlehem in the Israeli-occupied West Bank, on October 17, 2025. (Photo by Mussa Qawasma/Reuters)

A black gibbon is seen in a cage before being released into the wild by Indonesian nature conservation agency (BKSDA) in Jantho forest, Aceh province on August 26, 2021. (Photo by Chaideer Mahyuddin/AFP Photo)

(L-R) American rappers Doja Cat and Tyga perform on the Coachella stage during the 2022 Coachella Valley Music And Arts Festival on April 24, 2022 in Indio, California. (Photo by Amy Sussman/Getty Images for Coachella)

White-robed men hold up flaming torches during an annual fire festival at the World Heritage-listed Kumano Nachi Taisha shrine in the Wakayama Prefecture town of Nachikatsuura, western Japan on July 14, 2022. (Photo by Kyodo News/Newscom/Avalon)

A Kenyan police officer calls for reinforcement in front of a lorry set on fire by protesters during riots in the informal settlement of Kibera in Nairobia on May 2, 2023. Kenyan riot police were out on the streets on May 2, 2023 as the opposition defied a police ban and staged new demonstrations over the cost of living crisis and last year's election results. (Photo by Luis Tato/AFP Photo)

A vegetarian festival devotee gets medical attention after a parade at Jui Tui shrine on September 30, 2014 in Phuket, Thailand. (Photo by Borja Sanchez-Trillo/Getty Images)