This artist's scoreboard displays a fictional game between Mars and Earth, with Mars in the lead. It refers to the success rate of sending missions to Mars, both as orbiters and landers. Of the previous 39 missions targeted for Mars from around the world, 15 have been successes and 24 failures. For baseball fans, that's a batting average of .385. The United States has had 13 successes out of 18 attempts, or a “batting average” of .722. NASA's Curiosity rover, set to land on the Red Planet the evening of Aug. 5, 2012 PDT (morning of Aug. 6 EDT), will mark the United States' 19th attempt to tackle the challenge of Mars, and the world's 40th attempt. (Image by NASA/JPL-Caltech)

Growing cities, overuse of fertilizers and factory wastewater have degraded China's water supplies to the extent that half the nation's rivers and lakes are severely polluted. China aims to spend $850 billion to improve filthy water supplies over the next decade, but even such huge outlays may do little to reverse damage caused by decades of pollution and overuse in Beijing's push for rapid economic growth. Photo: Fishermen row a boat in the algae-filled Chaohu Lake in Hefei, Anhui province, June 19, 2009. (Photo by Jianan Yu/Reuters)

A member of the Eton public school O.T.C. (Officers Training Corps) practising shouting out orders during a training session, 20th January 1940. (Photo by Hulton Archive/Getty Images)

A Panasonic Toughpad is displayed during a press event at The Venetian for the 2012 International Consumer Electronics Show (CES) January 9, 2012 in Las Vegas, Nevada. CES, the world's largest annual consumer technology trade show, runs from January 10-13 and is expected to feature 2,700 exhibitors showing off their latest products and services to about 140,000 attendees. (Photo by Ethan Miller/Getty Images)

Rikkie Valerie Kolle, a transgender woman who was crowned Miss Netherlands, puts on her makeup in Voorthuizen, Netherlands on July 12, 2023. (Photo by Piroschka van de Wouw/Reuters)

French actress Adele Exarchopoulos poses during a photocall for the film “L'Amour Ouf” (Beating Hearts) at the 77th edition of the Cannes Film Festival in Cannes, southern France, on May 24, 2024. (Photo by Scott A Garfitt/Invision/AP Photo)

Carlos Melendez prepares to feed his pet squirrel “Colita” in downtown San Salvador January 29, 2015. (Photo by Jose Cabezas/Reuters)

Joseph's Amazing Racing Pigs entertain the crowds at the Gillingham And Shaftesbury Spring Countryside Show, on June 09, 2024 in Shaftesbury, England. The countryside show celebrates Dorset's rural life, traditions and culture. Initially set to be the first countryside show of Dorset's rural calendar but now featuring near the end of Spring after a postponement due to a waterlogged showground. (Photo by Finnbarr Webster/Getty Images)