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  2. PDF - Wikipedia

    en.wikipedia.org/wiki/PDF

    The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [23] A COS tree file consists primarily of objects, of which there are nine types: [16] Boolean values, representing true or false; Real numbers ...

  3. LaTeX - Wikipedia

    en.wikipedia.org/wiki/LaTeX

    LaTeX (/ ˈ l ɑː t ɛ k / ⓘ LAH-tek or / ˈ l eɪ t ɛ k / LAY-tek, [2] [Note 1] often stylized as L a T e X) is a software system for typesetting documents. [3] LaTeX markup describes the content and layout of the document, as opposed to the formatted text found in WYSIWYG word processors like Google Docs, LibreOffice Writer and Microsoft Word.

  4. Structural coloration - Wikipedia

    en.wikipedia.org/wiki/Structural_coloration

    Structural coloration in animals, and a few plants, is the production of colour by microscopically structured surfaces fine enough to interfere with visible light instead of pigments, although some structural coloration occurs in combination with pigments. For example, peacock tail feathers are pigmented brown, but their microscopic structure ...

  5. Cosmetics - Wikipedia

    en.wikipedia.org/wiki/Cosmetics

    Cleansing is a standard step in skin care routines. Skin cleansing includes some or all of these steps or cosmetics: Cleansers or foaming washes are used to remove excess dirt, oil, and makeup left on the skin. [24] Different cleansing products are aimed at various types of skin, such as sulfate-free cleansers and spin brushes. [24]

  6. Hyaluronic acid - Wikipedia

    en.wikipedia.org/wiki/Hyaluronic_acid

    Hyaluronic acid is a common ingredient in skin care products. Hyaluronic acid is used as a dermal filler in cosmetic surgery. [27] It is typically injected using either a classic sharp hypodermic needle or a micro-cannula. Some studies have suggested that the use of micro-cannulas can significantly reduce vessel embolisms during injections.

  7. Skin care - Wikipedia

    en.wikipedia.org/wiki/Skin_care

    Skin care or skincare is a range of practices that support skin integrity, enhance its appearance, and relieve skin conditions. They can include nutrition, avoidance of excessive sun exposure, and appropriate use of emollients. Practices that enhance appearance include the use of cosmetics, botulinum, exfoliation, fillers, laser resurfacing ...

  8. Parchment - Wikipedia

    en.wikipedia.org/wiki/Parchment

    The term originally referred only to the skin of sheep and, occasionally, goats. The equivalent material made from calfskin, which was of finer quality, was known as vellum [ 2 ] (from the Old French velin or vellin , and ultimately from the Latin vitulus , meaning a calf); [ 3 ] while the finest of all was uterine vellum , taken from a calf ...

  9. Retinyl palmitate - Wikipedia

    en.wikipedia.org/wiki/Retinyl_palmitate

    Retinyl palmitate is used as a source of vitamin A added to low fat milk and other dairy products to replace the vitamin content lost through the removal of milk fat. Palmitate is attached to the alcohol form of vitamin A, retinol, in order to make vitamin A stable in milk. [citation needed] Retinyl palmitate is also a constituent of some ...