Eritrean refugee children play at Mai-Aini refugee camp near the Eritrean boarder in the Tigrai region in Ethiopia February 10, 2016. Each month as many as 5,000 people flee Eritrea according to U.N. figures, estimates the Eritrean government disputes. The government puts the population at about 3.6 million, while other estimates suggest it could be almost double that. (Photo by Tiksa Negeri/Reuters)

Mug shot of William Stanley Moore, 1 May 1925, Central Police Station, Sydney. This picture appears in the Photo Supplement to the NSW Police Gazette, 28 July, 1926 captioned: “Opium dealer. Operates with large quantities of faked opium and cocaine. A wharf labourer; associates with water front thieves and drug traders”. (Photo by NSW Police Forensic Photography Archive, Justice & Police Museum, Histiric Houses Trust of NSW)

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.

A spinning top is seen on a hand during a performance at Sanxia old street in New Taipei City, Taiwan May 8, 2016. Taiwan's ancient folk art of spinning tops is kept alive by a group of enthusiasts who perform intricate tricks with the toys at a temple in Taipei, the capital. (Photo by Tyrone Siu/Reuters)

British actor Hugh Grant and his girlfriend Elizabeth Hurley attend the post-premiere party of Grant's latest film, “Four Weddings and a Funeral” in London, 11th May 1994. (Photo by Dave Hogan/Hulton Archive/Getty Images)

Christopher Blevins from the USA in action on his way winning the Cross Country Short Track Elite Men UCI XCC Mountain Bike World Series race in Nove Mesto na Morave, Czech Republic, 25 May 2025. (Photo by Maxime Schmid/EPA)

Tautumeitas from Latvia performs the song “Bur Man Laimi” during the dress rehearsal for the second semi-final of the 69th Eurovision Song Contest, in Basel, Switzerland, Wednesday, May 14, 2025. (Photo by Martin Meissner/AP Photo)

A woman poses for a photo next to lotus flowers in West lake in Hanoi, Vietnam, 09 June 2025.. Lotus flowers bloom from late May to August in Vietnam and are commonly found growing in the muddy waters of lakes and ponds across the country. (Photo by Luong Thai Linh/EPA)