A couple dance tango for tourists at Caminito, a touristic hotspot of La Boca neighborhood in Buenos Aires, Argentina, October 15, 2016. (Photo by Enrique Marcarian/Reuters)

NASA astronaut Reid Wiseman and European Space Agency astronaut Alexander Gerst (not shown) works outside the space station's Quest airlock in the first of three spacewalks for the Expedition 41 crew aboard the International Space Station in this NASA image released October 8, 2014. (Photo by Reuters/NASA)

An upside-down pair of pants is seen atop a mound of snow, Wednesday, February 20, 2019, the result of yet another snow storm to hit Omaha, Neb. The latest winter storm dumped more snow on top of the existing snow, creating a problem of what to do with all the cleared snow. (Photo by Nati Harnik/AP Photo)

A Xikrin woman holds her husband's shotgun while he cleans freshly hunted peccary in the river. According to tradition, Xikrin women are not allowed to leave the village while their husbands are out hunting a wife must patiently wait for his return. (Photo and caption by Taylor Weidman)

Seljalandsfoss waterfall, located in Iceland. Seljalandsfoss is one of the most famous waterfalls of Iceland. This waterfall of the river Seljalandsá drops 60 metres (200 ft) over the cliffs of the former coastline. It's possible to go behind the waterfall. (Photo by HotSpot Media)

In this September 30, 2013 photo, farmers wait for customers next to their 1950s Chevrolet loaded with garlic for sale at the 114th Street Market on the outskirts of Havana, Cuba. The market s bustle is a result of economic reforms begun in 2010 by President Raul Castro, which includes relaxing rules on private farming. (Photo by Ramon Espinosa/AP Photo)

In this Thursday, March 17, 2016 photo, 33-year-old Palestinian clown doctor Alaa Miqdad, left, entertains 3-year-old patient Yaqin Shawaf, who suffers from dialysis, in the department of kidney diseases at Al-Rantisi children's hospital in Gaza City. (Photo by Adel Hana/AP Photo)