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  2. Roblox - Wikipedia

    en.wikipedia.org/wiki/ROBLOX

    Roblox (/ ˈ r oʊ b l ɒ k s / ⓘ, ROH-bloks) is an online game platform and game creation system developed by Roblox Corporation that allows users to program and play games created by themselves or other users. It was created by David Baszucki and Erik Cassel in 2004, and released to the public in 2006. As of August 2020, the platform has ...

  3. Keystone (architecture) - Wikipedia

    en.wikipedia.org/wiki/Keystone_(architecture)

    The keystone (shown in red) of an arch Dropped keystone at Colditz Castle. A keystone (or capstone) is the wedge-shaped stone at the apex of a masonry arch or typically round-shaped one at the apex of a vault. In both cases it is the final piece placed during construction and locks all the stones into position, allowing the arch or vault to ...

  4. Keystone effect - Wikipedia

    en.wikipedia.org/wiki/Keystone_effect

    The keystone effect is the apparent distortion of an image caused by projecting it onto an angled surface. It is the distortion of the image dimensions, such as making a square look like a trapezoid, the shape of an architectural keystone, hence the name of the feature. In the typical case of a projector sitting on a table, and looking upwards ...

  5. Keystone species - Wikipedia

    en.wikipedia.org/wiki/Keystone_species

    Keystone mutualists are organisms that participate in mutually beneficial interaction, the loss of which would have a profound impact upon the ecosystem as a whole. For example, in the Avon Wheatbelt region of Western Australia , there is a period of each year when Banksia prionotes (acorn banksia) is the sole source of nectar for honeyeaters ...

  6. Path of Exile - Wikipedia

    en.wikipedia.org/wiki/Path_of_Exile

    Path of Exile is a free-to-play action role-playing video game developed and published by Grinding Gear Games.Following an open beta phase, the game was released for Microsoft Windows in October 2013.

  7. Keystone (beer brand) - Wikipedia

    en.wikipedia.org/wiki/Keystone_(beer_brand)

    Keystone beer is a product of the Molson Coors Beverage Company in Golden, Colorado. It was first introduced in Chico, California in September 1989. Keystone Ice can be found in canned, kegged , and occasionally, bottled form, with 5.9% ABV.

  8. Autostereogram - Wikipedia

    en.wikipedia.org/wiki/Autostereogram

    The top and bottom images produce a dent or projection depending on whether viewed with cross- () or wall- () eyed vergence. Autostereogram of a cube rotating. You will need to learn how to see an autostereogram to see this.

  9. Modified Newtonian dynamics - Wikipedia

    en.wikipedia.org/wiki/Modified_Newtonian_dynamics

    Modified Newtonian dynamics (MOND) is a theory that proposes a modification of Newton's second law to account for observed properties of galaxies.Its primary motivation is to explain galaxy rotation curves without invoking dark matter, and is one of the most well-known theories of this class.