Trilled R's and the dawn of recorded sound in America

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History Explained on Instagram: "Follow @HISTORY__EXPLAINED for more interesting content! ✅ Every CD holds its data as a continuous spiral of microscopic dents called pits, with flat areas known as lands in between. Each pit measures about one thousandth the width of a human hair. A CD player reads these by shining a laser onto the surface. Light reflects differently off pits and lands, and those tiny changes in brightness are converted into binary code. That is how sound, video, or files become