We humans are a noisy bunch. With our machines, trucks, sirens, horns, beeps, loudspeakers, airplanes, and lawnmowers, we have surrounded ourselves with the deafening sounds of progress. To be in a city is to cordon nature on the outside. The timid tweets and cooing of birds, rain hitting the pavement, and the occasional thunder are a few of the only sounds we hear from within our homes, if we bother to turn off the TV or computer or smartphones to pause to listen.