The authors of that are in charge of a $250M public project.
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Wow! How do they overcome all the attenuation of sound over air? 
I believe it travels faster over hot air.
Let me contribute that Napoleonic semaphores and indian smoke signals also travel at nearly 300000 km/s, although slightly slower than above as they operate in a medium.
Wonder what their gray matter is wired with.. 
Well I never!
Reminds me of Audiophools and their grasp of reality...
And they believe this absolute drivel...
My bad. I forgot to reference the source. Faq - SWIFT and expand the
"What are the economic and social challenges in the region?"
Is this why some people appear to be bright until they speak?