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  2. Tempering (metallurgy) - Wikipedia

    en.wikipedia.org/wiki/Tempering_(metallurgy)

    Grey-blue – 371 °C (700 °F) and higher – structural steel For carbon steel, beyond the grey-blue color the iron oxide loses its transparency, and the temperature can no longer be judged in this way, although other alloys like stainless steel may produce a much broader range including golds, teals, and magentas.

  3. Reactivity series - Wikipedia

    en.wikipedia.org/wiki/Reactivity_series

    In the first six periods this does not make a difference to the relative order, but in the seventh period it does, so the seventh-period elements have been excluded. (In any case, the typical oxidation states for the most accessible seventh-period elements thorium and uranium are too high to allow a direct comparison.) [ 11 ]

  4. List of Mad episodes - Wikipedia

    en.wikipedia.org/wiki/List_of_Mad_episodes

    A mashup of Minecraft and Criminal Minds; When several murders occur within the world of Minecraft, Morgan and Rossi are sent to investigate. 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.

  5. Carbon dioxide - Wikipedia

    en.wikipedia.org/wiki/Carbon_dioxide

    The symmetry of a carbon dioxide molecule is linear and centrosymmetric at its equilibrium geometry. The length of the carbon–oxygen bond in carbon dioxide is 116.3 pm, noticeably shorter than the roughly 140 pm length of a typical single C–O bond, and shorter than most other C–O multiply bonded functional groups such as carbonyls. [19]