The photographs feature fish that have been specially treated to make the stained skeletal tissues visible through the skin and flesh. The technique, developed by Dr. Adam Summers, uses dyes, hydrogen peroxide, a digestive enzyme and glycerin to make the flesh seem to disappear. Photo: This image of the butterfly ray (Gymnura crebripunctata) helped scientists study the joints in its wings. (Photo by Adam Summers)

A woman wears a flower crown during a Summer Solstice celebration on June 21, 2021 in Krakow, Poland. The summer solstice represents the longest day of the year, with the most hours of sunlight, and is celebrated by various cultures worldwide. (Photo by Omar Marques/Getty Images)

These are the stunning images of what looks like a picturesque winter wonderland – but actually shot in the middle of summer. Amateur photographer Catherine Perkinton, 45, has spent the summer travelling around the country to create the fabulous images by utilising infra-red. (Photo by Catherine Perkinton/SWNS/ABACAPress)

Girls bath inside a drum on a hot summer day at a field in New Delhi, April 18, 2017. (Photo by Adnan Abidi/Reuters)

A mahout splashes water on his elephant in the river Sabarmati on a hot summer day in Ahmedabad, India, May 20, 2015. (Photo by Amit Dave/Reuters)

Russian supermodel Irina Shayk shares a snap from an “island summer nite (sic)” in the last decade of August 2022. (Photo by irinashayk/Instagram)

A mahout splashes water on his elephant on a hot summer day in Ahmedabad, India on April 8, 2019. (Photo by Amit Dave/Reuters)

American socialite Kylie Jenner shows off her summer bikini style with friends in the second decade of June 2024. (Photo by kyliejenner/Instagram)