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2. Sphalerite - Wikipedia

   en.wikipedia.org/wiki/Sphalerite

   Sphalerite is a sulfide mineral with the chemical formula (Zn, Fe)S. [5] It is the most important ore of zinc . Sphalerite is found in a variety of deposit types, but it is primarily in sedimentary exhalative , Mississippi-Valley type , and volcanogenic massive sulfide deposits.

3. List of language self-study programs - Wikipedia

   en.wikipedia.org/wiki/List_of_language_self...

   This list is limited to programs that teach four or more languages. There are many others that teach one language. Alphabetical lists of languages show the courses available to learn each language, at All Language Resources, Lang1234, Martindale's Language Center, Omniglot, and Rüdiger Köppe.

4. Drops (app) - Wikipedia

   en.wikipedia.org/wiki/Drops_(app)

   Drops is a language learning app that was created in Estonia by Daniel Farkas and Mark Szulyovszky in 2015. [1] It is the second product from the company, after their first app, LearnInvisible, had issues in retaining a user's engagement over the required time period. [2]

5. File : Sphalerite - Creede, Mineral County, Colorado, USA.jpg

   en.wikipedia.org/wiki/File:Sphalerite_-_Creede...

   English: Black tetrahedral crystals of sphalerite up to 8 mm in size across this matrix (4.5 × 3.0 × 2.0 cm) with chalcopyrite and calcite. Found from Creede, Mineral County, Colorado, USA. Found from Creede, Mineral County, Colorado, USA.

6. File:Sphalerite (mine near Carthage, Tennessee, USA) 1 ...

   en.wikipedia.org/wiki/File:Sphalerite_(mine_near...

   Sphalerite is also distinctive in being moderately heavy for its size and having six different planes of cleavage. Sphalerite is the most important zinc ore mineral. Zinc produced from sphalerite is used for many purposes, including mixing with copper to produce brass, rust protection of iron & steel, and for making modern American pennies ...

7. Duolingo - Wikipedia

   en.wikipedia.org/wiki/Duolingo

   Duolingo Inc. [b] is an American educational technology company that produces learning apps and provides language certification.Duolingo offers courses on 43 languages, [5] ranging from English, French, and Spanish to less commonly studied languages such as Welsh, Irish, and Navajo, and even constructed languages such as Klingon. [6]

8. Voxy - Wikipedia

   en.wikipedia.org/wiki/Voxy

   Prior to the 2014 World Cup in Brazil, Voxy distributed its English language-learning platform to 40,000 affiliates of the car service 99Taxis. [ 15 ] [ 16 ] In 2014, Voxy announced a partnership with Brothers For All, a South African nonprofit dedicated to providing educational support to ex-inmates of the South African prison system and at ...

9. Mondly - Wikipedia

   en.wikipedia.org/wiki/Mondly

   Mondly Languages is a language learning app that integrates chatbot and speech recognition technologies to help users learn any of the 33 languages it offers. [ 28 ] [ 29 ] Mondly Kids is a language learning app for toddlers and kids.