This article is about supposed portals to the underworld from the surface of the earth. For other uses, see Gates of Hell (disambiguation). Fengdu Ghost City The gates of hell are various places on the surface of the world that have acquired a legendary reputation for being entrances to the underworld. Often they are found in regions of unusual geological activity, particularly volcanic areas, or
Separation of a compressed gas into a hot stream and a cold stream The vortex tube, also known as the Ranque-Hilsch vortex tube, is a mechanical device that separates a compressed gas into hot and cold streams. The gas emerging from the hot end can reach temperatures of 200 °C (390 °F), and the gas emerging from the cold end can reach −50 °C (−60 °F).[1] It has no moving parts and is considered an
Computer networks use numeric network addresses to identify communications endpoints in a network of participating devices. This is similar to the telephone network which assigns a string of digits to identify each telephone. In modern networking protocols, information to be transmitted is divided into a series of network packets. Every packet contains the source and destination addresses for the
Fried Coke or Deep Fried Soda is a frozen Coca-Cola-flavored batter that is deep-fried and then topped with Coca-Cola syrup, whipped cream, cinnamon sugar, and a cherry.[1][2] It was introduced by inventor Abel Gonzales Jr. at the 2006 State Fair of Texas;[3][4][5] Gonzales is also the creator of recipes for deep-fried butter and deep-fried beer at later Texas State Fairs.[6][7] The concoction won
This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. Android phones, like this Nexus S running Replicant, allow installation of apps from the Play Store, F-Droid store or directly via APK files. This is a list of notable applications (apps) that run on the Android platform which meet guidelines fo
A global catastrophic risk or a doomsday scenario is a hypothetical event that could damage human well-being on a global scale,[2] even endangering or destroying modern civilization.[3] An event that could cause human extinction or permanently and drastically curtail humanity's existence or potential is known as an "existential risk".[4] In the 21st century, a number of academic and non-profit org
Screenshot of PYXIS WorldView showing an ISEA geodesic grid. A geodesic grid is a spatial grid based on a geodesic polyhedron or Goldberg polyhedron. The earliest use of the (icosahedral) geodesic grid in geophysical modeling dates back to 1968 and the work by Sadourny, Arakawa, and Mintz[1] and Williamson.[2][3] Later work expanded on this base.[4][5][6][7][8] A geodesic grid is a global Earth re
Enormous gypsum crystals (CaSO 4 · 2 H 2O) in the most spectacular Naica cavern, found during mining. Note the size of the person at the bottom right for the scale. The Naica Mine of the Mexican state of Chihuahua, is a lead, zinc and silver mine.[1][2] Located in Naica in the municipality of Saucillo, the Naica Mine is owned by Industrias Peñoles,[3] the world's largest silver producer.[4][5] Cav
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