One Square Inch of Silence

One Square Inch of Silence is the quietest place in the United States.

One Square Inch of Silence was designated on Earth Day 2005 (April 22, 2005) to protect and manage the natural soundscape in Olympic Park’s backcountry wilderness. The logic is simple; if a loud noise, such as the passing of an aircraft, can impact many square miles, then a natural place, if maintained in a 100% noise-free condition, will also impact many square miles around it. It is predicted that protecting a single square inch of land from noise pollution will benefit large areas of the park.

Local radio proves a lifeline in Haiti

from PRI's The World

Communications are still disrupted in Haiti, hampering relief efforts. Cell phone service, is, however, slowly being restored, as are Internet connections. But in the aftermath of the earthquake, many Haitians have turned to local radio as a way to get, and share, information. We hear from Mario Viau, director of SignalFM in Port-au-Prince, which has somehow managed to keep broadcasting, on the airwaves and online, since the earthquake struck.

Acoustic Levitation Chamber

by Dr. David Deak:

This is an acoustic levitation chamber I designed and built in 1987 as a micro-gravity experiment for NASA related subject matter.
The 12 inch cubed plexiglas Helmholtz Resonant Cavity has 3 speakers attached to the cube by aluminium acoustic waveguides.
By applying a continuous resonant(600Hertz) sound wave, and by adjusting the amplitude and phase relationship amongst the 3 speakers; I was able to control levitation and movement in all 3 (x,y,z) axis of the ambient space.

Seed Magazine segment on Acoustic Ecology

Seed Magazine segment on Acoustic Ecology

Peoples Temple Radio Codebook

Peoples Temple used coded messages in shortwave broadcasts between Jonestown, Georgetown and San Francisco, in part to circumvent FCC regulations on conducting business over amateur airwaves. In the first section of codes, for example, Peoples Temple cloaked its legal discussions – which were not permitted under its HAM radio license – with references to medical procedures.

To ensure that different radio operators understood each other, the Temple created a code book of aliases and cryptic phrases, the contents of which are published below.