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Educative Giant Crystal Cave in Naica, Mexico
Giant Crystal Cave in Naica, Mexico

Cave of the Crystals or Giant Crystal Cave is a cave connected to the Naica Mine 300 metres (980 ft) below the surface in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, CaSO4·2 H2O), some of the largest natural crystals ever found. The cave's largest crystal found to date is 12 m (39 ft) in length, 4 m (13 ft) in diameter and 55 tons in weight. The cave is extremely hot with air temperatures reaching up to 58 °C (136 °F) with 90 to 99 percent humidity. The cave is relatively unexplored due to these factors. Without proper protection people can only endure approximately ten minutes of exposure at a time.
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20 May 2014 07:56:00
Fact Cyclophonica Band – a Musical Ride
Members of the Cyclophonica band play instruments as they make a stop during a ride in Rio de Janeiro May 17, 2015. (Photo by Pilar Olivares/Reuters)

Members of the Cyclophonica band play instruments as they make a stop during a ride in Rio de Janeiro May 17, 2015. The Cyclophonica band was formed by a group of musicians riding bicycles around the city, mixing sport and culture and entertaining people on the streets, according to its founder Leonardo Fuks. (Photo by Pilar Olivares/Reuters)
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19 May 2015 11:46:00
Fact The Day in Photos – May 23, 2015
Participants of the the goth festival “Wave Gothic Festival” walk in fancy costumes along the festival area in Leipzig, central Germany, Saturday, May 23, 2015. About 20,000 members of the scene are expected to attend one of the world's largest gothic and “dark” culture festivals until May 25, 2015. (Photo by Jens Meyer/AP Photo)

Participants of the the goth festival “Wave Gothic Festival” walk in fancy costumes along the festival area in Leipzig, central Germany, Saturday, May 23, 2015. About 20,000 members of the scene are expected to attend one of the world's largest gothic and “dark” culture festivals until May 25, 2015. (Photo by Jens Meyer/AP Photo)
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24 May 2015 10:10:00
Fact Reconstruction of Daily Life and Traditional Holidays in Khakassia
Members of national folklore and ethnographic groups and employees of a museum-preserve participate in the reconstruction of daily life and traditional holidays celebrated by indigenous population of the Republic of Khakassia during a demonstration for visitors outside a traditional wooden yurt near Kazanovka village, southwest of the city of Abakan, Russia, July 24, 2015. (Photo by Ilya Naymushin/Reuters)

Members of national folklore and ethnographic groups and employees of a museum-preserve participate in the reconstruction of daily life and traditional holidays celebrated by indigenous population of the Republic of Khakassia during a demonstration for visitors outside a traditional wooden yurt near Kazanovka village, southwest of the city of Abakan, Russia, July 24, 2015. (Photo by Ilya Naymushin/Reuters)
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27 Jul 2015 11:07:00
Fact Plastic Balls Bathing
Members of the general public enjoy the “BEACH” at the National Building Museum August 25, 2015 in Washington, DC. The “BEACH” is an interactive architectural installation, with an “ocean” of nearly one million recyclable translucent plastic balls, that brings the experience of going to the beach indoor. (Photo by Alex Wong/Getty Images)

Members of the general public enjoy the “BEACH” at the National Building Museum August 25, 2015 in Washington, DC. The “BEACH” is an interactive architectural installation, with an “ocean” of nearly one million recyclable translucent plastic balls, that brings the experience of going to the beach indoor. (Photo by Alex Wong/Getty Images)
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27 Aug 2015 11:31:00
Fact Anti-Terror Drill in Kiev
Members of the Ukrainian Interior Ministry's special battalion Kiev-1 rescue a hostage, who was detained by a mock terroist, during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)

Members of the Ukrainian Interior Ministry's special battalion Kiev-1 rescue a hostage, who was detained by a mock terroist, during an anti-terror drill in Kiev, Ukraine, August 28, 2015. (Photo by Valentyn Ogirenko/Reuters)
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29 Aug 2015 10:41:00
Fact The Week in Pictures: January 22 – January 30, 2015. Part 4/7
Members of the “Avalon” team wearing 14th century knight costumes fight against each other on the bank of the Yenisei River during the regional amateurs tournament of clubs of historical reconstruction, “The Battle of the Nations 2015. Siberia”, in Krasnoyarsk January 24, 2015. (Photo by Ilya Naymushin/Reuters)

Members of the “Avalon” team wearing 14th century knight costumes fight against each other on the bank of the Yenisei River during the regional amateurs tournament of clubs of historical reconstruction, “The Battle of the Nations 2015. Siberia”, in Krasnoyarsk January 24, 2015. (Photo by Ilya Naymushin/Reuters)
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31 Jan 2015 13:09:00
Fact PEGIDA (Patriotic Europeans Against the Islamisation of the West) protests in Belgium
Members of the Belgian branch of Germany's anti-Islam group, PEGIDA (Patriotic Europeans Against the Islamisation of the West), take part in a demonstration in Antwerp, March 2, 2015. Germany has experienced an upsurge of anti-Islam sentiment in the form of weekly PEGIDA protests in Dresden. REUTERS/Eric Vidal

Members of the Belgian branch of Germany's anti-Islam group, PEGIDA (Patriotic Europeans Against the Islamisation of the West), take part in a demonstration in Antwerp, March 2, 2015. Germany has experienced an upsurge of anti-Islam sentiment in the form of weekly PEGIDA protests in Dresden. REUTERS/Eric Vidal
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06 Mar 2015 09:56:00
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