Soap Bubble Structures by Kym Cox. Bubbles optimise space and minimise their surface area for a given volume of air. This phenomenon makes them a useful tool in many areas of research, in particular, materials science and “packing” – how things fit together. Bubble walls drain under gravity, thin at the top, thick at the bottom, which interferes with travelling lightwaves to create bands of colour. Black spots show the wall is too thin for interference colours, indicating the bubble is about to burst. (Photo by Kym Cox/2019 Science Photographer of the Year/RPS)

Oil pools in a leaf on the beach following an oil slick at Tanjong Beach in Sentosa, Singapore on June 15, 2024. (Photo by Edgar Su/Reuters)

Sunrise over Maridalsvannet in the forest areas near the outskirts of Oslo, the capital of Norway. Winter is approaching, the first snow covers the ground, and the water has already got a thin layer of ice. The temperature is significantly below the freezing point, the air is clear and the sun colors the morning clouds in deep tones. (Photo by Tore-Thiis-Fjeld/Getty Images)

Rose oil production in Bulgaria's famous Rose Valley is set to increase by 25 percent according to a mid-season estimate by experts in spite of the climate changes and economy crisis. Bulgaria is traditionally one of the biggest world exporters of high-grade rose oil along with Morocco and neighboring Turkey, with clients mostly from the United States, France, Germany, United Kingdom and Japan. Rose oil is the most commonly used essential oil in the perfume industry.

Solid Light, an exhibition of the immersive works of Anthony McCall, opens at Tate Modern in London on June 25, 2024. Installations use beams of light projected through a thin mist to create large three-dimensional forms. (Photo by Guy Bell/Alamy Live News)

Wrestlers compete in the 63rd Historical Cali Oil Wrestling Tournament, held on June 29, 2025, in Bursa, Turkiye. The event, which featured over 800 wrestlers and served as the final rehearsal for the 664th Historical Kirkpinar Oil Wrestling Festival, is on track to become a stage of the Oil Wrestling League, now in its third season. (Photo by Mustafa Yilmaz/Anadolu via Getty Images)