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  2. Gene-centered view of evolution - Wikipedia

    en.wikipedia.org/wiki/Gene-centered_view_of...

    The gene-centered view of evolution, gene's eye view, gene selection theory, or selfish gene theory holds that adaptive evolution occurs through the differential survival of competing genes, increasing the allele frequency of those alleles whose phenotypic trait effects successfully promote their own propagation.

  3. Mass surveillance in the United States - Wikipedia

    en.wikipedia.org/wiki/Mass_surveillance_in_the...

    The practice of mass surveillance in the United States dates back to wartime monitoring and censorship of international communications from, to, or which passed through the United States. After the First and Second World Wars, mass surveillance continued throughout the Cold War period, via programs such as the Black Chamber and Project SHAMROCK.

  4. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    A relatively new type of telescopic sight, called prismatic telescopic sight, prismatic sight or "prism scope", replaces the image-erecting relay lenses of a traditional telescope with a roof prism design commonly found in compact binoculars, monoculars and spotting scopes.

  5. History of optics - Wikipedia

    en.wikipedia.org/wiki/History_of_optics

    History of optics. Modern ophthalmic lens making machine. Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek philosophers, and the development of geometrical optics in the Greco-Roman world. The word optics is derived from the Greek term ...

  6. Keith B. Alexander - Wikipedia

    en.wikipedia.org/wiki/Keith_B._Alexander

    Keith Brian Alexander (born December 2, 1951) is a retired four-star general of the United States Army, who served as director of the National Security Agency, chief of the Central Security Service, and commander of the United States Cyber Command.

  7. Eyeglass prescription - Wikipedia

    en.wikipedia.org/wiki/Eyeglass_prescription

    Prism and Base Prism refers to a displacement of the image through the lens, often used to treat strabismus and other binocular vision disorders. The prism value is measured in prism diopters, and Base refers to the direction of displacement. PL is an abbreviation for plano or plain, meaning no prescription