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)

“Family disagreement”. (Photo by Vlado Pirsa/Comedy Wildlife Photo Awards 2019)

Hidden Britain category winner. Garden Spider by Alan Smith from Reading, Berkshire. (Photo by Alan Smith/British Wildlife Photography Awards/PA Wire Press Association)

A competitor drives his homemade vehicle without an engine during the Red Bull Soapbox Race in Amman, Jordan on September 20, 2019. (Photo by Muhammad Hamed/Reuters)

Transgender model and musician Jessica Cortez reacts as she is prepared before walking in the CHULO underwear show during New York Fashion Week, which raised money for transgender and cisgender young women victims of violence, in New York, U.S., February 7, 2019. (Photo by Andrew Kelly/Reuters)

A model presents a creation from the Chromat collection during New York Fashion Week in New York, U.S., February 8, 2019. (Photo by Caitlin Ochs/Reuters)

American rapper and songwriter Lil' Kim performs as she presents a creation from The Blonds Autumn/Winter 2019 collection during New York Fashion Week in New York, U.S. on February 12, 2019. (Photo by Andrew Kelly/Reuters)

A model presents a creation during the Vivienne Westwood catwalk show at London Fashion Week Women's A/W19 in London, Britain February 17, 2019. (Photo by Henry Nicholls/Reuters)