1. two seas of different densities collide off the Alaskan coast

    two seas of different densities collide off the Alaskan coast

    (Source: pamelalovenyc.com)

  2. Halloween costumes - 1957

    Halloween costumes - 1957

    (Source: pamelalovenyc.com)

  3. Albert Einstein visits Hopi House circa 1931

    Albert Einstein visits Hopi House circa 1931

    (Source: pamelalovenyc.com)