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  2. Human blood in veins is not actually blue. Blood is red due to the presence of hemoglobin; deoxygenated blood (in veins) has a deep red color, and oxygenated blood (in arteries) has a light cherry-red color. Veins below the skin can appear blue or green due to subsurface scattering of light through the skin, and aspects of human color ...

  3. Lapis lazuli - Wikipedia

    en.wikipedia.org/wiki/Lapis_Lazuli

    Lapis lazuli (UK: / ˌ l æ p ɪ s ˈ l æ z (j) ʊ l i, ˈ l æ ʒ ʊ-,-ˌ l i /; US: / ˈ l æ z (j) ə l i, ˈ l æ ʒ ə-,-ˌ l i /), or lapis for short, is a deep-blue metamorphic rock used as a semi-precious stone that has been prized since antiquity for its intense color.

  4. Fracking - Wikipedia

    en.wikipedia.org/wiki/Fracking

    Hydraulic fracturing [a] is a well stimulation technique involving the fracturing of formations in bedrock by a pressurized liquid. The process involves the high-pressure injection of "fracking fluid" (primarily water, containing sand or other proppants suspended with the aid of thickening agents) into a wellbore to create cracks in the deep rock formations through which natural gas, petroleum ...

  5. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    3LR12 (4.5-volt), D, C, AA, AAA, AAAA (1.5-volt), A23 (12-volt), PP3 (9-volt), CR2032 (3-volt), and LR44 (1.5-volt) batteries (Matchstick for reference). This is a list of the sizes, shapes, and general characteristics of some common primary and secondary battery types in household, automotive and light industrial use.

  6. Leaf - Wikipedia

    en.wikipedia.org/wiki/Leaf

    A leaf (pl.: leaves) is a principal appendage of the stem of a vascular plant, [1] usually borne laterally above ground and specialized for photosynthesis.Leaves are collectively called foliage, as in "autumn foliage", [2] [3] while the leaves, stem, flower, and fruit collectively form the shoot system. [4]

  7. List of Mad episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Mad_episodes

    It is ultimately revealed that the culprit is none other than Mark Zuckerberg, who has been killing Minecraft players as revenge for the game being a bigger waste of time than Facebook. Other sketches : MAD News, the Grim Reaper Ruins His TV Night, Kirby 's Star Tours, Balloon Salesman Pop, Sassie , Spy vs. Spy , Hamster Gym, MAD Security Cam ...

  8. Estrogen (medication) - Wikipedia

    en.wikipedia.org/wiki/Estrogen_(medication)

    Synthetic estrogens have markedly stronger effects on the liver and hepatic protein synthesis than natural estrogens. [ 1 ] [ 87 ] [ 88 ] [ 86 ] [ 89 ] This is related to the fact that synthetic estrogens like ethinylestradiol are much more resistant to metabolism in the liver than natural estrogens.

  9. History of Microsoft - Wikipedia

    en.wikipedia.org/wiki/History_of_Microsoft

    Microsoft is a multinational computer technology corporation. Microsoft was founded on April 4, 1975, by Bill Gates and Paul Allen in Albuquerque, New Mexico. [1] Its current best-selling products are the Microsoft Windows operating system; Microsoft Office, a suite of productivity software; Xbox, a line of entertainment of games, music, and video; Bing, a line of search engines; and Microsoft ...