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  2. 50 Divisions - Wikipedia

    en.wikipedia.org/wiki/50_Divisions

    "50 Divisions" is the most widely used standard for organizing specifications and other written information for commercial and institutional building projects in the United States and Canada. Standardizing the presentation of such information improves communication among all parties.

  3. Dark matter - Wikipedia

    en.wikipedia.org/wiki/Dark_matter

    History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...

  4. NASA spin-off technologies - Wikipedia

    en.wikipedia.org/wiki/NASA_spin-off_technologies

    Spinoff is a NASA publication featuring technology made available to the public. Since 1976, NASA has featured an average of 50 technologies each year in the annual publication, and Spinoff maintains a searchable database of these technologies. When products first spun off from space research, NASA presented a black and white report in 1973 ...

  5. United States Air Force - Wikipedia

    en.wikipedia.org/wiki/United_States_Air_Force

    The United States Air Force ( USAF) is the air service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. [12] Originally created on 1 August 1907, as a part of the United States Army Signal Corps, the USAF was established as a separate branch of the United States Armed Forces in 1947 with ...

  6. QR code - Wikipedia

    en.wikipedia.org/wiki/QR_code

    The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; the pattern of position detection was found and determined by applying the least-used ratio (1:1:3:1:1) in black ...

  7. Photomultiplier tube - Wikipedia

    en.wikipedia.org/wiki/Photomultiplier_Tube

    After 50 years, during which solid-state electronic components have largely displaced the vacuum tube, the photomultiplier remains a unique and important optoelectronic component. Perhaps its most useful quality is that it acts, electronically, as a nearly perfect current source , owing to the high voltage utilized in extracting the tiny ...

  8. United States military occupation code - Wikipedia

    en.wikipedia.org/wiki/United_States_military...

    A United States military occupation code, or a military occupational specialty code ( MOS code ), is a nine-character code used in the United States Army and United States Marine Corps to identify a specific job. In the United States Air Force, a system of Air Force Specialty Codes (AFSC) is used. In the United States Navy, a system of naval ...

  9. American black bear - Wikipedia

    en.wikipedia.org/wiki/American_black_bear

    Synonyms. Euarctos americanus. The American black bear ( Ursus americanus ), also known as the black bear, is a species of medium-sized bear endemic to North America. It is the continent's smallest and most widely distributed bear species. The American black bear is an omnivore, with a diet varying greatly depending on season and location.

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