The maid-themed cafe in Hangzhou, China on September 29, 2016. A cafe has been bringing in droves of new customers after hiring young women to dress up in Frech maid costumes while serving diners. Curious coffee- and coffee-lovers are coming from all corners of Hangzhou, capital of East China's Zhejiang Province, to get a taste of the “maid cafe” experience. The business is said to have been opened by a man surnamed Yu and his friends, all whom are natives or graduates of the city. The all-female staff who donned the black and white French maid outfits are also students currenting living or studying in Hangzhou, allowing them to marry their passion for serving with the part-time job. (Photo by AsiaWire)

A Muslim woman wearing a hijab walks past a lingerie advertisement in downtown Vancouver, British Columbia April 26, 2013. (Photo by Andy Clark/Reuters)

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“Old Mursi woman”. Old woman by the huts of her village. Location: Marenke, Omo valley, Ethiopia. (Photo and caption by Jorge Fernandez/National Geographic Traveler Photo Contest)

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“Sokolica”. Sokolica, Poland. (Photo and caption by Marcin Kęsek/National Geographic Traveler Photo Contest)

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“Say cheese”. Cheetahs jumped on the vehicle of tourists in Masai Mara national park, Kenya. (Photo and caption by Yanai Bonneh/National Geographic Traveler Photo Contest)

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“Cub”. In the colony of penguins in South Georgia. (Photo and caption by Ondrej Zaruba/National Geographic Traveler Photo Contest)

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This artwork created using the end of a drill is the work of Swiss photographer Fabian Oefner who captures the flight of paint in just one 40,000th of a second. His latest Black Hole series celebrates the physics of centripetal force and the effects it has on simple paint and a an ordinary drill with a metal rod connected on the end. The incredible result of Fabians work comes out looking like a picture taken on the Hubble Telescope of some cosmic event. (Photo by Fabian Oefner/Caters News)

A cenote is a natural phenomenon, a sinkhole in the Earth’s surface. The Yucatan Peninsula in Mexico has an estimated 7,000 cenotes because it is primarily made up of porous limestone. For millions of years, rainfall slowly ate away at the limestone and a huge system of underground caves and caverns was formed. Many filled with water from rain or from the underground water table. When the roof of a water filled cave collapses, a cenote is born. The water found in a cenote may be fresh water, salt water, or both. Structurally it may be completely open, like a lake, almost completely closed with just a small opening at the top, or somewhere in between.