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  2. Human body weight - Wikipedia

    en.wikipedia.org/wiki/Human_body_weight

    Human body weight is a person's mass or weight.. Strictly speaking, body weight is the measurement of mass without items located on the person. Practically though, body weight may be measured with clothes on, but without shoes or heavy accessories such as mobile phones and wallets, and using manual or digital weighing scales.

  3. 1978 California Proposition 13 - Wikipedia

    en.wikipedia.org/wiki/1978_California_Proposition_13

    This resulted in increased pupil-to-teacher ratios in K-12 public schools in California. Professor Betts observed in 2010 that "pupil-teacher ratios start to skyrocket in the years immediately after 1978, and a huge gap opens up between pupil-teacher ratios here and in the rest of the country, and we still haven't recovered from that."

  4. Color rendering index - Wikipedia

    en.wikipedia.org/wiki/Color_rendering_index

    Researchers use daylight as the benchmark to which to compare color rendering of electric lights. In 1948, daylight was described as the ideal source of illumination for good color rendering because "it (daylight) displays (1) a great variety of colors, (2) makes it easy to distinguish slight shades of color, and (3) the colors of objects around us obviously look natural".

  5. Vacuum tube - Wikipedia

    en.wikipedia.org/wiki/Vacuum_tube

    Later thermionic vacuum tubes, mostly miniature style, some with top cap connections for higher voltages. A vacuum tube, electron tube, [1] [2] [3] thermionic valve (British usage), or tube (North America) [4] is a device that controls electric current flow in a high vacuum between electrodes to which an electric potential difference has been applied.