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Evidence for Dark Matter

  • Known Unknowns

    “As we know, There are known knowns.
    There are things we know we know.
    We also know There are known unknowns.
  • That is to say We know there are some things
    We do not know.
  • But there are also unknown unknowns,
    The ones we don't know We don't know."

  • • -- Donald Rumsfeld, Secretary of Defense,
    February 12, 2002, Department of Defense news briefing

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MYR 9.99

MYR 9.99

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