Lance Cpl. Blas Trevino of the 1st Battalion, 5th Marines, shouts out as he is rescued on a medevac helicopter from the U.S. Army's Task Force Lift “Dust Off”, Charlie Company 1-214 Aviation Regiment after he got shot in the stomach outside Sangin, in the Helmand Province of southern Afghanistan on June 11, 2011. The Army's 'Dust Off' crew needed two attempts to get him out, as they were fired upon and took five rounds of bullets into the tail of their aircraft. (Photo by Anja Niedringhaus/AP Photo/File)

Travellers wait in queue to test for COVID-19 at a train station in Mumbai, India, Tuesday, November 30, 2021. (Photo by Rafiq Maqbool/AP Photo)

This photograph shows installing of the artwork of Venezuelan-US artist Alex Da Corte titled “Kermit the Frog, Even” at Place Vendome in Paris, on October 19, 2025, ahead of the official opening of the Art Basel contemporary and modern art market. (Photo by Dimitar Photo)

Bob Woodward looks at the reconstruction he built of the Orpheus Pavement at Prinknash Abbey on March 31, 2010 in Gloucester, England. The replica mosiac, made of more than one-and-a-half million pieces of stone is described as one of the most significant archaeological projects of recent times. (Photo by Matt Cardy/Getty Images)

A man dressed as Santa Claus poses during a base flying event in downtown in Berlin December 6, 2014. Participants of the event hosted by entertainment agency Jochen Schweizer flew down 98 metres (322 ft.) from atop the hotel in the German capital. (Photo by Hannibal Hanschke/Reuters)

A Hindu villager rides a motorcycle past an altar ahead of the annual Kasada festival at the Mount Bromo in Indonesia's East Java province, July 30, 2015. The Kasada festival will be held on August 1, when the worshippers throw offerings such as livestock and other crops into the volcanic crater of Mount Bromo to give thanks to the Hindu gods for ensuring their safety and prosperity. (Photo by Reuters/Beawiharta)

Skeleton involves a person riding a small sled down a frozen track while lying face down. The sport is a more intense form of luge because skeleton competitors leap onto the sled and slide downhill head first. Skeleton athletes can reach up to 80 mph on straightaways, causing forces up to 5g, so the helmet is a critical component for attitude as well as safety.

A round circle of smoke coming from the mouth of the Etna volcano is seen in the sky during an eruption on the southern Italian island of Sicily April 11, 2013. Mount Etna is Europe's tallest and most active volcano. (Photo by Antonio Parrinello/Reuters)