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  Zarrella's Hierarchy of Contagi - Dan Zarrella

  1 45 0 2022-01-24

  Zarrella's Hierarchy of Contagiousness: The Science, Design, and Engineering of Contagious Ideas
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  Up and Down Stairs_ The History - Jeremy Musson

  1 78 0 2022-01-24

  Country houses were reliant on an intricate hierarchy of servants, each of whom provided an essential skill. Up and Down Stairs brings to life this hierarchy, showing how large num...