A photographer tested the concentration of several pairs of dogs as he captured their reactions to treat time in a series of shots. Christian Vieler, 47, of Waltrop, Germany, has been a professional dog photographer since 2016. He came up with the idea of snapping two dogs catching treats simultaneously. Here: Basset Hounds. (Photo by Vieler Photography/Caters News Agency)

Ebiowei, 48, carries an empty oil container on his head to a place where it would be filled with refined fuel at an illegal refinery site near river Nun in Nigeria's oil state of Bayelsa November 27, 2012. Locals in the industry say workers can earn $50 to $60 a day. Thousands of people in Nigeria engage in a practice known locally as “oil bunkering” – hacking into pipelines to steal crude then refining it or selling it abroad. The practice, which leaves oil spewing from pipelines for miles around, managed to lift around a fifth of Nigeria's two million barrel a day production last year according to the finance ministry. (Photo by Akintunde Akinleye/Reuters)

In this May 8, 2015 photo, sisters Zoraida Infante, left, and Graciela Trujillo pray on Fishermen's Beach before therapeutic swimming in the Pacific Ocean in Lima, Peru. Under overcast skies, the bathers practice thalassotherapy, which derives from the Greek “thalasso”, for “sea”, and draws on the ocean's healing properties. (Photo by Rodrigo Abd/AP Photo)

Mariam Emad from Parkour Egypt “PKE” practices her parkour skills around buildings on the outskirts of Cairo, Egypt on July 20, 2018. A group of Egyptian women gather at an abandoned park in a Cairo suburb once a week, climbing walls and jumping around in the strenuous physical discipline known as Parkour, while also challenging the country's conservative social norms. (Photo by Amr Abdallah Dalsh/Reuters)

A poster of Russian President Vladimir Putin is used as target practice along a trench on the frontline with Russia-backed separatists near Zolote village, in the Lugansk region, on January 21, 2022. Ukraine's Foreign Minister Dmytro Kuleba on January 22, 2022, slammed Germany for its refusal to supply weapons to Kyiv, urging Berlin to stop “undermining unity“ and “encouraging Vladimir Putin” amid fears of a Russian invasion. (Photo by Anatolii Stepanov/AFP Photo)

A scuba diver during an ice diving class at the Sea Frogs scuba diving center in the Russian Far Eastern city of Vladivostok, Russia on January 30, 2022. The air temperature is –11°C (12.2°F), the water temperature is –2°C (28.4°F). Scuba divers undergo theoretical and practical training in ice diving and perform dives in the open water during the day and the night time as part of the Ice Diver NDL special program. (Photo by Yuri Smityuk/TASS)

Cameroonian para-athlete and taekwondo African champion Marie-Antoinette Ndassi (R) and Cameroonian taekwondo para-athlete Chemogne Teukam Guileine (C) practice some moves during a training session at a gym in Yaounde, on May 31, 2024. Taekwondo para-athletes Marie-Antoinette Ndassi and Chemogne Teukam Guileine will represent Cameroon following their qualification for the upcoming Paris 2024 Paralympic Games. (Photo by Daniel Beloumou Olomo/AFP Phoot)

Invasion (laser girls) 2017. “I’m always thinking about my art practice, so any experience I have may spike a visual when I have an idea in mind. An example is that, when I was thinking about the Invasion series, I was inspired by Alfred Hitchcock’s movie The Birds (1963). I love Hitchcock’s other movies and have been contemplating a series based on Rear Window (1954). I also find inspiration outside the cinema in music clips and magazines”. (Photo by Michael Cook/Perimeter Books)