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TIL the Etch A Sketch line you see when drawing is actually an absence. Twisting the knobs moves a stylus that displaces aluminum powder, showing a dark background. Shaking it returns the powder to the internal surface. It sold 600k units in the launch year.

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6kQW TIL the “d” and “t” sounds have same exact mouth and tongue positions, the only difference is you add voice to make the “d” sound.
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