Axel, a research prototype rover for exploring the Moon, Mars and other planets, is remotely driven over rocks as engineers from Jet Propulsion (JPL) and grad students from Caltech (California Institute of Technology) demonstrate its mobile over the steep and rocky grounds of the JPL Mars Yard on January 14, 2009 in Pasadena, California. The rover is capable of descending cliffs or into craters and returning by a cable tethered to its starting point. Development of the Axel rover is a point effort funded by NASA Exploration Systems Mission Directorate (ESMD) and lead by Principal Investigator Issa Newnas and Co-Investigator and Caltech professor of mechanical engineering bio engineering Joel Burdick. (Photo by David McNew/Getty Images)

U.S. Army soldiers carry an injured soldier who was shot in the leg, through a poppy field on April 24, 2011 in the Arghandab River Valley, Kandahar Province, Afghanistan. The injured was evacuated to a waiting Blackhawk UH-60A helicopter by Task Force Thunder Brigade, Charlie company 1st of the 52nd Aviation regiment from Fairbanks, Alaska. It is feared that as weather improves with the approaching summer that the casualty toll will rise. (Photo by Paula Bronstein/Getty Images)

Sumatran tiger Jumilah is seen with one of her cubs on display at Taronga Zoo on October 25, 2011 in Sydney, Australia. The Sumatran tiger cubs, born in August to mother Jumilah, will meet the public for the first time this week. (Photo by Mark Kolbe/Getty Images)

A placard featuring an image of Russian President Vladimir Putin and reading “We are with him for the sovereignty of Russia! And you?” is seen left in front of the Russian State Duma building in central Moscow on February 24, 2022. (Photo by Kirill Kudryavtsev/AFP Photo)

An iguana rests on a man's head during a pet blessing ceremony a day after World Animal Day, at a mall in Quezon City, Metro Manila, Philippines on October 5, 2025. (Photo by Noel Celis/Reuters)

A Ukrainian man stands in protest in front of gunmen in unmarked uniforms as they stand guard in Balaklava, on the outskirts of Sevastopol, Ukraine, Saturday, March 1, 2014. (Photo by Andrew Lubimov/AP Photo)

An Indian laborer talks on his mobile phone as he transports a refrigerator on his back at a market in Jammu, India, Sunday, June 7, 2020. India whose coronavirus caseload is fifth highest in the world has partially restored trains and domestic flights and allowed reopening of shops and manufacturing. (Photo by Channi Anand/AP Photo)