99% Invisible-61- A Series of Tubes

<p>Pneumatic (adj.):  of, or pertaining to, air, gases, or wind. In the world before telephone, radio, and email, the tasks of transmitting information and moving material objects were essentially the same challenge.  The way you sent someone a message was … <a href="http://99percentinvisible.prx.org/2012/09/20/99-invisible-61-a-series-of-tubes/" rel="nofollow" target="_blank">Continue reading →</a></p>