Natalia Grossman of the USA competes during the women's finals of the IFSC Climbing World Cup Meiringen on April 09, 2022 in Meiringen, Switzerland. (Photo by Marco Kost/Getty Images)

Dancers disguised as forest spirits pose before performing during the Kendalisada Art Festival 2023 in Kaliori, Banyumas, Central Java, on September 9, 2023. (Photo by Yasuyoshi Chiba/AFP Photo)

A handout picture taken and released by the British Ministry of Defence (MOD) on March 25, 2024 shows humanitarian aid being airdropped over Gaza from a RAF A400M aircraft The Royal Air Force airdropped over 10 tonnes of food supplies into Gaza for the first time on Monday, as part of international efforts to provide life-saving assistance to civilians. The aid consists of water, rice, cooking oil, flour, tinned goods and baby formula. (Photo by Leah Jones/MOD/AFP Photo)

A man reacts as he holds the equipment used by Palestinian cameraman Hussam al-Masri, who was a contractor for Reuters, at the site where he was killed along with other journalists and people in Israeli strikes on Nasser hospital, in Khan Younis in the southern Gaza Strip, in this still image taken from a video shot by Reuters contractor Hatem Khaled, who was wounded shortly afterwards in another strike while he was filming the site on August 25, 2025. (Photo by Hatem Khaled/Reuters)

A soldier of the Household Cavalry Mounted Regiment falls off a horse during a practice to participate in the state ceremonial surrounding this year's Platinum Jubilee celebrations at Hyde Park in London, Thursday, March 31, 2022. Around 170 horses and personnel of the Household Cavalry Mounted Regiment left their Hyde Park Barracks to form up and be inspected by the General Officer Commanding the Household Division, Major General Christopher Ghika. (Photo by Frank Augstein/AP Photo)

Ukrainian army soldier Dasha, 22, checks her phone after a military sweep to search for possible remnants of Russian troops after their withdrawal from villages in the outskirts of Kyiv, Ukraine, Friday, April 1, 2022. (Photo by Rodrigo Abd/AP Photo)

Supporters of the PHTK presidential candidate Jovenel Moise strike zombie poses during a protest march demanding the resignation of interim President Jocelerme Privert in Port-au-Prince, Haiti, Tuesday, June 7, 2016. The electoral council of Haiti has decided to re-do a presidential election that a special commission determined was marred by fraud. (Photo by Dieu Nalio Chery/AP Photo)

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)