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  2. Tueller Drill - Wikipedia

    en.wikipedia.org/wiki/Tueller_Drill

    The Tueller Drill is a self-defense training exercise to prepare against a short-range knife or melee attack when armed only with a holstered handgun.. Sergeant Dennis Tueller of the Salt Lake City Police Department wondered how quickly an attacker with a knife, or other melee weapon, could cover 21 feet (6.4 m), so he timed volunteers as they raced to stab the target.

  3. Instructions per second - Wikipedia

    en.wikipedia.org/wiki/Instructions_per_second

    Instructions per second. Instructions per second (IPS) is a measure of a computer 's processor speed. For complex instruction set computers (CISCs), different instructions take different amounts of time, so the value measured depends on the instruction mix; even for comparing processors in the same family the IPS measurement can be problematic.

  4. Immigrant generations - Wikipedia

    en.wikipedia.org/wiki/Immigrant_generations

    The term second-generation immigrant attracts criticism due to it being an oxymoron. Namely, critics say, a "second-generation immigrant" is not an immigrant, since being "second-generation" means that the person is born in the country and the person's parents are the immigrants in question. Generation labeling immigrants is further complicated ...

  5. Minute and second of arc - Wikipedia

    en.wikipedia.org/wiki/Minute_and_second_of_arc

    The nautical mile (nmi) was originally defined as the arc length of a minute of latitude on a spherical Earth, so the actual Earth's circumference is very near 21 600 nmi. A minute of arc is ⁠π 10 800⁠ of a radian. A second of arc, arcsecond (arcsec), or arc second, denoted by the symbol ″, [2] is ⁠ 1 60 ⁠ of an arcminute, ⁠ 1 3600 ...

  6. Femtosecond - Wikipedia

    en.wikipedia.org/wiki/Femtosecond

    10−15 s. A femtosecond is a unit of time in the International System of Units (SI) equal to 10 −15 or 1⁄1 000 000 000 000 000 of a second; that is, one quadrillionth, or one millionth of one billionth, of a second. [1] A femtosecond is to a second, as a second is to approximately 31.69 million years. For context, a ray of light travels ...

  7. 555 timer IC - Wikipedia

    en.wikipedia.org/wiki/555_timer_IC

    555 timer IC. The 555 timer IC is an integrated circuit used in a variety of timer, delay, pulse generation, and oscillator applications. It is one of the most popular timing ICs due to its flexibility and price. Derivatives provide two (556) or four (558) timing circuits in one package. [2]

  8. Special Report on Global Warming of 1.5 °C - Wikipedia

    en.wikipedia.org/wiki/Special_Report_on_Global...

    The Special Report on Global Warming of 1.5 °C (SR15) was published by the Intergovernmental Panel on Climate Change (IPCC) on 8 October 2018. [1] The report, approved in Incheon, South Korea, includes over 6,000 scientific references, and was prepared by 91 authors from 40 countries. [1] In December 2015, the 2015 United Nations Climate ...

  9. Millisecond - Wikipedia

    en.wikipedia.org/wiki/Millisecond

    A millisecond (from milli- and second; symbol: ms) is a unit of time in the International System of Units equal to one thousandth (0.001 or 10 −3 or 1 / 1000) of a second [1][2] or 1000 microseconds. A millisecond is to one second, as one second is to approximately 16.67 minutes. A unit of 10 milliseconds may be called a centisecond, and one ...

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