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2. 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 music, [ 5 ] math, [ 6 ] and 43 languages, [ 7 ] ranging from English , French , and Spanish to less commonly studied languages such as Welsh , Irish , and Navajo . [ 8 ]

3. Fire glass - Wikipedia

   en.wikipedia.org/wiki/Fire_glass

   Fire glass. Fire glass (also fire pit glass, fire rocks, fire beads or lava glass) is a type of tempered glass, chunks of which are used decoratively on fireplaces. Pieces of the glass are heaped around jets of burning gas, or around liquid ethanol, in order to conceal the jets and reflect the flames. [1] It is an alternative to ceramic and ...

4. Obsidian - Wikipedia

   en.wikipedia.org/wiki/Obsidian

   Obsidian (/ əbˈsɪdi.ən, ɒb -/ əb-SID-ee-ən ob-) [5] is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. [6] Obsidian is produced from felsic lava, rich in the lighter elements such as silicon, oxygen, aluminum, sodium, and potassium.

5. Free Online Games: Play board games, card games, casino ... - AOL

   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.

6. Fire making - Wikipedia

   en.wikipedia.org/wiki/Fire_making

   Fire making, fire lighting or fire craft is the process of artificially starting a fire. It requires completing the fire triangle , usually by heating tinder above its autoignition temperature . Fire is an essential tool for human survival and the use of fire was important in early human cultural history since the Lower Paleolithic .

7. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

8. Fire rock - Wikipedia

   en.wikipedia.org/wiki/Fire_rock

   Fire rock. Fire rock is manufactured lava rock that is sold in various shapes and sizes, and is used as a medium for retaining direct heat. Fire rocks are used in natural gas fireplaces or in natural gas or propane burning fire pits. It may be used as the main fuel distributor or as padding for fire glass to go on top.

9. Control of fire by early humans - Wikipedia

   en.wikipedia.org/wiki/Control_of_fire_by_early...

   The control of fire by early humans was a critical technology enabling the evolution of humans. Fire provided a source of warmth and lighting, protection from predators (especially at night), a way to create more advanced hunting tools, and a method for cooking food. These cultural advances allowed human geographic dispersal, cultural ...