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  3. Window cleaner - Wikipedia

    en.wikipedia.org/wiki/Window_cleaner

    Window cleaning and window cleaners are the subject of songs, films and comment, often with comic intent. Examples include George Formby's comic song "The Window Cleaner", also known as "When I'm Cleaning Windows" is one of the best known. Films about window cleaners include The Window Cleaner (1968) [15] and Confessions of a Window Cleaner ...

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  5. Self-cleaning surfaces - Wikipedia

    en.wikipedia.org/wiki/Self-cleaning_surfaces

    Self-cleaning surfaces are a class of materials with the inherent ability to remove any debris or bacteria from their surfaces in a variety of ways. The self-cleaning functionality of these surfaces are commonly inspired by natural phenomena observed in lotus leaves, gecko feet, and water striders to name a few.

  6. List of school shootings in the United States (2000–present ...

    en.wikipedia.org/wiki/List_of_school_shootings_in...

    A criminal justice club student picked up a loaded gun, belonging to an advisor, which the student thought was an unloaded training weapon. She then shot at a wall target, unintentionally firing a bullet, which went through the wall and broke a window. The advisor was a licensed peace officer permitted to carry a firearm on campus. [328]

  7. Cleanroom - Wikipedia

    en.wikipedia.org/wiki/Cleanroom

    When cleaning, only special mops and buckets are used. Cleaning chemicals used tend to involve sticky elements to trap dust, and may need a second step with light molecular weight solvents to clear. Cleanroom furniture is designed to produce a minimum of particles and is easy to clean.