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After the Laser does its job of reading the numbers from the CD's surface, a tiny computer inside the CD player turns those numbers into sound. The laser is perfect for this job because the beam is small enough to "see" the tiny pits. The pits must be so small because it takes millions of them to make the digital code required for one CD filled with music. In fact, the CD player must read approximately 44,100 pits for every second of music you hear. The pits are so tiny that it would take 40 of them, lined up side by side, just to equal the width of one human hair.