Digital computers have been commercially available for almost 70 years, and yet the digital “revolution” is a relatively new phenomenon, beginning in the early 1980s with the introduction of the IBM PC.
Why the delay? Two words: speed and memory. And those two words lead to a third: cost.
When an object vibrates in air, it will vibrate air molecules around it. Those air molecules will vibrate other molecules around them and so on. When this wave reaches our ear it vibrates our ear drum. the brain interprets as sound.
