Archaeologist, Maria Jose Gamez, 32, holds the skull of a human skeleton after technical workers exhumed the remains of 18 people, who were killed during the Spanish Civil War, from a mass grave at a cemetery in Jimena de la Frontera, Spain, July 20, 2021. REUTERS/Jon Nazca

A skeleton which helps athletes showing where it hurts them, is seen at the U.S. Women and Men's National Volleyball Teams training center, ahead of the Tokyo Olympics, in Anaheim, California, U.S., July 5, 2021 . Picture taken July 5, 2021. REUTERS/Aude Guerrucci

The skeleton of a seabird rests on a sign advertising tours of the former sealing plant on St. George, Alaska, U.S., May 23, 2021. Inclement weather and inconsistent flights have hampered the island’s budding tourism industry. Picture taken on May 23, 2021. REUTERS/Nathan Howard

A plastinated human body is seen in front of a human skeleton during the "Body Worlds" exhibition by German anatomist Gunther von Hagens at the Halle 622 exhibition hall in Zurich, Switzerland May 7, 2021. REUTERS/Arnd Wiegmann

Undated image shows a human skeleton from a tomb at the Nile Delta, in this image released on April 27, 2021 by archaeological mission operating in the archaeological area of Dakahlia Governorate north of Cairo, via Egypt's Ministry of Antiquities. The Egyptian Ministry of Antiquities/Handout via REUTERS ATTENTION EDITORS

The skeleton of a Tyrannosaurus rex, the large meat-eating dinosaur that lived in western North America and went extinct 66 million years ago, is displayed at the Smithsonian National Museum of Natural History in Washington, U.S. June 16, 2019. Picture taken June 16, 2019. REUTERS/Will Dunham

A 35000 years old skeleton is displayed at the National Museum of Egyptian Civilization after its reopening in Cairo, Egypt, April 5, 2021. REUTERS/Mohamed Abd El Ghany

Visitors look at a 35000 years old skeleton that is displayed at the National Museum of Egyptian Civilization after its reopening in Cairo, Egypt, April 5, 2021. REUTERS/Mohamed Abd El Ghany

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Silver medalist pilot Benjamin Maier of Austria, gold medalist pilot Francesco Friedrich of Germany and bronze medalist pilot Johannes Lochner of Germany celebrate on the podium after the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich, Thorsten Margis, Candy Bauer and Alexander Schueller celebrate after finishing first in the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich celebrates winning gold with teammates Thorsten Margis, Candy Bauer and Alexander Schueller in the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich, Thorsten Margis, Candy Bauer and Alexander Schueller celebrate winning gold in the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich, Thorsten Margis, Candy Bauer and Alexander Schueller celebrate winning gold in the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich celebrates winning gold in the 4-man bobsleigh with teammates Thorsten Margis, Candy Bauer and Alexander Schueller REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich, Thorsten Margis, Candy Bauer and Alexander Schueller celebrate after finishing first in the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Austria's Benjamin Maier, Danut Moldovan, Markus Sammer, Kristian Huber celebrate finishing second in the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Johannes Lochner, Florian Bauer, Christopher Weber and Christian Rasp celebrate during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Johannes Lochner, Florian Bauer, Christopher Weber and Christian Rasp celebrate during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Latvia's Oskars Kibermanis, Davis Springis, Mattis Miknis and Krists Lindenblats in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Latvia's Oskars Kibermanis, Davis Springis, Mattis Miknis and Krists Lindenblats in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Canada`s Justin Kripps, Cam Stones, Ryan Sommer and Benjamin Coakwell in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany`s Christoph Hafer, Kevin Korona, Christian Hammers and Philipp Wobeto in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany`s Johannes Lochner, Florian Bauer, Christopher Weber and Christian Rasp in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Switzerland's Michael Vogt, Silvio Weber, Oliver Gyger and Andreas Haas in action during the 4-man bobsleigh REUTERS/Matthias Rietschel TPX IMAGES OF THE DAY

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 South Korea`s Won Yunjong, Kim Jinsu, Lee Gyeongmin and Jung Hyunwoo in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Italy's Patrick Baumgartner, Eric Fantazzini, Constantino Ughi, Lorenzo Bilotti in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Latvia's Oskars Kibermanis, Davis Springis, Mattis Miknis and Krists Lindenblats in action during the 4-man bobsleigh REUTERS/Matthias Rietschel TPX IMAGES OF THE DAY

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany`s Christoph Hafer, Kevin Korona, Christian Hammers and Philipp Wobeto in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany`s Christoph Hafer, Kevin Korona, Christian Hammers and Philipp Wobeto in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany`s Johannes Lochner, Florian Bauer, Christopher Weber and Christian Rasp in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Canada`s Justin Kripps, Cam Stones, Ryan Sommer and Benjamin Coakwell in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich, Thorsten Margis, Candy Bauer and Alexander Schueller in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Francesco Friedrich, Thorsten Margis, Candy Bauer and Alexander Schueller in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Austria's Benjamin Maier, Danut Moldovan, Markus Sammer, Kristian Huber in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Austria's Benjamin Maier, Danut Moldovan, Markus Sammer, Kristian Huber in action during the 4-man bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates after winning the women's Monobob REUTERS/Matthias Rietschel TPX IMAGES OF THE DAY

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates winning gold in the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates winning gold in the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates after winning the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates on the podium after winning gold in the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates after winning the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Laura Nolte after finishing third in the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Germany's Stephanie Schneider in action during the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates winning the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates winning after the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates winning after the women's Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 14, 2021 Kaillie Humphries of the U.S. celebrates winning after the women’s Monobob REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Latvia's Oskars Kibermanis, Davis Springis, Mattis Miknis and Krists Lindenblats in action during heat 1 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Romania's Mihai Tentea, Raul Constantin Dobre, Ciprian Daroczi and Cristian Radu in action during heat 1 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Switzerland's Cedric Follador, Nicola Mariani, Dominik Hufschmid and Maruan Giumma in action during heat 1 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Canada's Justin Kripps, Cam Stones, Ryan Sommer and Benjamin Coakwell in action during heat 2 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Latvia's Oskars Kibermanis, Davis Springis, Mattis Miknis and Krists Lindenblats in action during heat 2 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Germany's Christoph Hafer, Kevin Korona, Christian Hammers and Philipp Wobeto in action during heat 2 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Germany's Christoph Hafer, Kevin Korona, Christian Hammers and Philipp Wobeto in action during heat 2 in the 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Germany`s Johannes Lochner, Florian Bauer, Christopher Weber, Christian Rasp in action during heat 2 in 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Germany`s Johannes Lochner, Florian Bauer, Christopher Weber, Christian Rasp in action during heat 2 in 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Austria`s Benjamin Maier, Danut Moldovan, Markus Sammer, Kristian Huber in action during heat 2 in 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Austria`s Benjamin Maier, Danut Moldovan, Markus Sammer, Kristian Huber in action during heat 2 in 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Germany`s Francesco Friedrich, Thorsten Margis, Candy Bauer, Alexander Schueller in action during heat 2 in 4-men bobsleigh REUTERS/Matthias Rietschel

Bobsleigh - Bobsleigh & Skeleton World Championships - DKB Eiskanal Altenberg, Altenberg, Germany - February 13, 2021 Germany`s Francesco Friedrich, Thorsten Margis, Candy Bauer, Alexander Schueller in action during heat 2 in 4-men bobsleigh REUTERS/Matthias Rietschel