There was this little blurb in the Smithsonian Natural History museum in the ancient sea life (aka my favorite) section about the notion that during the period when the only things that were really around were trilobites and cephalopods, the world might have been totally silent (in terms of life making noise and/or getting jiggy to said noise).
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The question is, was it an uncomfortable silence?
*ba-doom tshhhhh*