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  2. Attic ladder - Wikipedia

    en.wikipedia.org/wiki/Attic_ladder

    An attic ladder (US) or loft ladder (UK) is a retractable ladder that is installed into an attic door/access panel. They are used as an inexpensive and compact alternative to having a stairway that ascends to the attic of a building. They are useful in areas with space constraints that would hinder the installation of a standard staircase.

  3. Ladder - Wikipedia

    en.wikipedia.org/wiki/Ladder

    Attic ladder, pulled down from the ceiling to allow access to an attic or loft. Bridge ladder, a ladder laid horizontally to act as a passage between two points separated by a drop. Boarding ladder, a ladder used to climb onto a vehicle. May be rigid or flexible, also boarding step(s), and swim ladder. Cat ladder (US chicken ladder), a ...

  4. Glossary of firefighting - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_firefighting

    Hook ladder: Short ladder with a long hook at the top. The hook is used to smash a window and grip the window frame while the fire fighter climbs. Using one or two it is easy to go up and down floors beyond the reach of other ladders or when there's no space to pitch a ladder.

  5. Scientists Defy Physics, Basically Pull Energy Out of Thin Air

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  6. Redox gradient - Wikipedia

    en.wikipedia.org/wiki/Redox_gradient

    [4] [5] The redox ladder displays the order in which redox reactions occur based on the free energy gained from redox pairs. [ 4 ] [ 5 ] [ 6 ] These redox gradients form both spatially and temporally as a result of differences in microbial processes, chemical composition of the environment, and oxidative potential.

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