A demonstrator kicks a riot police vehicle during an unauthorized march called by the Chilean student federations to protest against government's education reform, in Santiago, Chile July 5, 2016. (Photo by Ivan Alvarado/Reuters)

Schoolchildren run during the eruption of Mount Lewotobi Laki-Laki, as seen from Lewolaga village in East Flores, East Nusa Tenggara, Indonesia on November 7, 2024. (Photo by Arnold Welianto/AFP Photo)

Women dressed in traditional costumes sing Christmas carols as they gather to celebrate Orthodox Christmas at a compound of the National Architecture museum in Kyiv, Ukraine on January 7, 2022. (Photo by Valentyn Ogirenko/Reuters)

Hindu devotees prepare to carry an idol of the elephant-headed Hindu deity Ganesha on the first day of ten-day “Ganesh Chaturthi” festival in Mumbai on August 31, 2022. (Photo by Punit Paranjpe/AFP Photo)

A sign reading “STOP Danger of Avalanches” blocks a local road on January 11, 2012 near Ischgl, Austria. Over the last few days heavy snowfalls have caused chaos in parts of Austria and Switzerland by blocking rail and road connections, stranding vacationers at mountain ski resorts and creating the risk of avalanches throughout the region. (Photo by Johannes Simon/Getty Images)

Runners warm up during the Team Pants And Bra photcall at City Hall on January 26, 2012 in London, England. Team Pants and Bra sprinted through central London this morning, encouraging fellow runners to join TeamPB and proudly wear pants and bras for the Virgin London Marathon in April, representing The Prostate Cancer Charity and Breast Cancer Care. (Photo by Ian Gavan/Getty Images for Prostate Cancer)

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.

Passengers check their mobile devices as a bin is full of garbage during a protest by the cleaning staff at Barcelona's airport, Spain, December 1, 2016. (Photo by Albert Gea/Reuters)