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Highest Rated Sign

Video id: #816 (enlarge)
Post date: 6/26/2011
Posted by: MORIT
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Element

  • Definition: A substance that contains only one kind of atom.

    Source: Kelter P, Mosher M, and Scott A (2008). Chemistry: the Practical Science. New York: Houghton Mifflin Company.

  • 9:27am 9/19/2013

    User: rogertbiles

    Post count: 4

    Wish we could have a simple sign. Why not the sign PURE, using both index fingers?