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  2. Terraria - Wikipedia

    en.wikipedia.org/wiki/Terraria

    Terraria is a 2D sandbox game with gameplay that revolves around exploration, building, crafting, combat, survival, and mining, playable in both single-player and multiplayer modes. [ 3 ] [ 4 ] The game has a 2D sprite tile-based graphical style reminiscent of the 16-bit sprites found on the Super NES . [ 4 ]

  3. Knife making - Wikipedia

    en.wikipedia.org/wiki/Knife_making

    The natural volcanic glass obsidian can achieve a nearly molecular edge (high achievable sharpness) and only requires Stone Age technology to work, [2] but is so brittle that it cannot maintain that sharpness for very long. Additionally, The entire blade is highly susceptible to being accidentally broken.

  4. Obsidian - Wikipedia

    en.wikipedia.org/wiki/Obsidian

    Obsidian can be used to make extremely sharp knives, and obsidian blades are a type of glass knife made using naturally occurring obsidian instead of manufactured glass. Obsidian is used by some surgeons for scalpel blades, although this is not approved by the US Food and Drug Administration (FDA) for use on humans. [61]

  5. Obsidian use in Mesoamerica - Wikipedia

    en.wikipedia.org/wiki/Obsidian_use_in_Mesoamerica

    Obsidian projectile point.. Obsidian is a naturally formed volcanic glass that was an important part of the material culture of Pre-Columbian Mesoamerica.Obsidian was a highly integrated part of daily and ritual life, and its widespread and varied use may be a significant contributor to Mesoamerica's lack of metallurgy.

  6. Obsidian Entertainment - Wikipedia

    en.wikipedia.org/wiki/Obsidian_Entertainment

    Obsidian Entertainment, Inc. is an American video game developer based in Irvine, California and part of Xbox Game Studios.It was founded in June 2003, shortly before the closure of Black Isle Studios, by ex-Black Isle employees Feargus Urquhart, Chris Avellone, Chris Parker, Darren Monahan, and Chris Jones.

  7. Space Shuttle thermal protection system - Wikipedia

    en.wikipedia.org/wiki/Space_Shuttle_thermal...

    The filler materials were made of either white AB312 fibers or black AB312 cloth covers (which contain alumina fibers). These materials were used around the leading edge of the nose cap, windshields, side hatch, wing, trailing edge of elevons, vertical stabilizer, the rudder/speed brake, body flap, and heat shield of the shuttle's main engines.

  8. Testudo formation - Wikipedia

    en.wikipedia.org/wiki/Testudo_formation

    In the testudo formation, the men would align their shields to form a packed formation covered with shields on the front and top. [1] The first row of men, possibly excluding the men on the flanks, would hold their shields from about the height of their shins to their eyes, so as to cover the formation's front.

  9. Obsidian (character) - Wikipedia

    en.wikipedia.org/wiki/Obsidian_(character)

    Obsidian (Todd James Rice) is a superhero published by DC Comics. He first appeared in All-Star Squadron #25 (September 1983), and was created by Roy Thomas and Jerry Ordway. [1] He is the son of Alan Scott and Rose Canton and the twin brother of Jade. According to an Infinity, Inc. letter page, Obsidian was named "Todd" after a friend of Thomas.