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  2. Stair lift - Wikipedia

    en.wikipedia.org/wiki/Stair_lift

    For sufficiently wide stairs, a rail is mounted to the treads of the stairs. A chair or lifting platform is attached to the rail. A person gets onto the chair or platform and is lifted up or down the stairs by the chair which moves along the rail. Stair lifts are known variously as stairlifts, stair-lifts, chair lifts, stair gliders and by ...

  3. Stair climbing - Wikipedia

    en.wikipedia.org/wiki/Stair_climbing

    Stair climbing has developed into the organized sport tower running.Every year several stair climbing races are held around the world with the competitors running up the stairs of some of the world's tallest buildings and towers (e.g., the Empire State Building, Gran Hotel Bali), or on outside stairs such as the Niesenbahn Stairway.

  4. Penrose stairs - Wikipedia

    en.wikipedia.org/wiki/Penrose_stairs

    In the real world, the hero should always be in front of the villain throughout this chase. However, in the case of the Penrose stairs the hero descends another flight of stairs to catch up to the antagonist and catch him unaware. [14] The cover of the 2011 album Angles by American rock band The Strokes depicts a complex set of Penrose stairs.

  5. Raising and lowering indices - Wikipedia

    en.wikipedia.org/wiki/Raising_and_lowering_indices

    In Euclidean space, raising and lowering is not necessary due to vectors and covector components being the same., is Minkowski space (or rather, Minkowski space in a choice of orthonormal basis), a model for spacetime with weak curvature. It is common convention to use greek indices when writing expressions involving tensors in Minkowski space ...

  6. List of Supernatural and The Winchesters characters - Wikipedia

    en.wikipedia.org/wiki/List_of_Supernatural_and...

    Harrington is spotted from down the hall by the Winchesters and Dean throws an angel blade into Harrington's neck like a throwing knife, killing Harrington. The move surprises and impresses Sam and Donatello while Dean comments how housekeeping will not be pleased to have to clean up Harrington's body.