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The main source of natural light on Earth is the Sun. Historically, another important source of light for humans has been fire, from ancient campfires to modern kerosene lamps. With the development of electric lights and power systems, electric lighting has effectively replaced firelight.
Grey literature: 700,000 Indexes European grey literature: Free Institut de l'information scientifique et technique: ORCID [64] Multidisciplinary: An open and independent registry for contributor identification in research and academic publishing. List: biography, education, employment, works, grants, peer-review. Over 9.3 million profiles. Free
This is a list of sources of light, the visible part of the electromagnetic spectrum.Light sources produce photons from another energy source, such as heat, chemical reactions, or conversion of mass or a different frequency of electromagnetic energy, and include light bulbs and stars like the Sun. Reflectors (such as the moon, cat's eyes, and mirrors) do not actually produce the light that ...
A literature review can be a type of review article. In this sense, a literature review is a scholarly paper that presents the current knowledge including substantive findings as well as theoretical and methodological contributions to a particular topic. Literature reviews are secondary sources and do
Einstein's argument that falling light acquires energy. To show that the equivalence principle necessarily implies the gravitation of energy, Einstein considered a light source separated along the z-axis by a distance above a receiver in a homogeneous gravitational field having a force per unit mass of 1 .
Review articles come in the form of literature reviews and, more specifically, systematic reviews; both are a form of secondary literature. [21] Literature reviews provide a summary of what the authors believe are the best and most relevant prior publications. Systematic reviews determine an objective list of criteria, and find all previously ...
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Prefer recent reviews to older primary sources on the same topic. If recent reviews do not mention an older primary source, the older source is dubious. Conversely, an older primary source that is seminal, replicated, and often-cited may be mentioned in the main text in a context established by reviews.