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)

People run as Haiti's Senator Jean Marie Ralph Fethiere (PHTK) fires a gun in the air, injuring Chery Dieu-Nalio, a photographer for Associated Press, while facing opposition supporters in the parking lot of the Haitian Parliament and Senate, as the government attempted to confirm the appointment of nominated Prime Minister Fritz William Michel, in Port-au-Prince, Haiti on September 23, 2019. (Photo by Andres Martinez Casares/Reuters)

An innovative photographer attached a camera to a remote-controlled car, allowing him to capture angles of wild lions, rhinos and other animals. Over the last 11 years, Chris Bray has been taking pictures of animals using his toy car contraption while he takes guests on photography tours in Kenya. (Photo by Chris Bray/Caters News Agency)

Luling, Louisiana, US. New evidence contradicts previous claims of the relative safety of glyphosate, the world’s most widely used herbicide, which is manufactured here. It is often used in conjunction with seeds that have been genetically modified to tolerate its application, meaning that anyone consuming these crops is eating a genetically modified plant, and whatever residue of the pesticide that remains. (Photo by J. Henry Fair/Industrial Scars/Papadakis Publisher)

Denis and Nelya, both 30, from Moscow, Russia invited brown bear Stepan along to their very special ceremony. As well as witnessing the couple exchange vows, the bear also played the role of registrar at one point. Denis said: “We both knew Stepan is a very kind bear but still it is a huge, unpredictable animal so we were a bit scared, but still happy to be able to make our dream come true. It was a fantastic experience to have this photoshoot with Stepan”. (Photo by Olga Barantseva/Caters News)

In the hours 41-year-old Ralph Savelsberg is not working as a physicist for the Dutch Ministry of Defence, he is recreating classic vehicles in everyones favourite bricks. Ralph said: Building a LEGO set is fun, but I've always preferred to build my own models. Here: “Ghostbusters”. (Photo by Ralph Savelsberg/Caters News)

Venezuela's acting President and presidential candidate Nicolas Maduro kisses a painting of late Venezuelan president Hugo Chavez during a campaign rally in the state of Vargas April 9, 2013. Venezuelans will hold presidential elections on April 14. Maduro promised on Tuesday to hike Venezuela's minimum wage by about 40 percent if he is elected in a weekend vote to replace late socialist leader Chavez. (Photo by Carlos Garcia Rawlins/Reuters)

Yak near Yamdrok lake, Tibet. It is a long-haired bovinae found throughout the Himalayan region of south Central Asia, the Tibetan Plateau and as far north as Mongolia and Russia. The Tibetan economy is dominated by subsistence agriculture. Due to limited arable land, the primary occupation of the Tibetan Plateau is raising livestock, such as sheep, cattle, goats, camels, yaks, dzo, and horses. The Tibetan yak is an integral part of Tibetan life. (Photo by Dennis Jarvis)