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So subsequently the Last Word posed a second question.
Each of these numerous terms has had its advocates, who point up potential distinctive features.
From the early twentieth century, duplicating machines such as the mimeograph and Gestetner stencil devices were used to produce short copy runs (typically 10–50 copies) for classroom or home use.
The use of media for instructional purposes is generally traced back to the first decade of the 20th century with the introduction of educational films (1900s) and Sidney Pressey's mechanical teaching machines (1920s).
An earlier questioner asked how metal blades in wet shavers lost their sharpness so easily on human hair.
One answer said that alternating blades in a razor made each one last longer than if left in place until they became blunt.