Wow.

We live in a sonic world, immersed in vibrations that stimulate microscopic hair cells deep inside our ears. This unseen energy influences our mood, our learning, even our health. We experience it as comforting music, as information-laden speech, or—all too often—as irritating noise, a by-product of our increasingly mechanized world. Despite all the ways sound affects us, we often let it slip unnoticed into the background of our lives. Hoping to understand it better, I set out to explore the mysteries of sound in the course of one day.

(via Instapaper)