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 fan wipes her lip after she was hit on the mouth by a foul ball hit by Kansas City Royals' Brandon Moss during the third inning of the Royals' baseball game against the Chicago White Sox, Friday, September 22, 2017, in Chicago. (Photo by David Banks/AP Photo)

American model Kendall Jenner in the second decade of May 2024 hits the steam room for FWRD. (Photo by Kendall Jenner/Instagram)

A severe thunderstorm hits Omaha, Neb., on Wednesday, June 12, 2024. (Photo by Chris Machian/Omaha World-Herald via AP Photo)

A rainbow over the windmill in Lytham, Lancashire on May 17, 2022 at sunset after rain hit the region last night after the hottest day of the year. (Photo by Gregg Wolstenholme/Bav Media)

Alexa Grasso, left, is hit by Valentina Shevchenko during a UFC 285 mixed martial arts flyweight title bout Saturday, March 4, 2023, in Las Vegas. (Photo by David Becker/AP Photo)

A Ukrainian police officer takes cover in front of a burning building that was hit in a Russian airstrike in Avdiivka, Ukraine, Friday, March 17, 2023. (Photo by Evgeniy Maloletka/AP Photo)

Teens got their glad rags on as they hit the town in Newcastle city centre, United Kingdom on August 16, 2018, as they celebrate their exam results. (Photo by North News and Pictures/NNP)